The structure that separates the thoracic cavity from the abdominopelvic cavity is______.
Answers
The structure that separates the thoracic cavity from the abdominopelvic cavity is diaphragm.
What is meant by the diaphragm?The diaphragm, which is located beneath the lungs, is the primary respiratory muscle. It is a large, dome-shaped muscle that contracts rhythmically and involuntarily most of the time. The diaphragm contracts and flattens upon inhalation, and the chest cavity expands.
The diaphragm is a birth control barrier. With typical use, it is moderately effective, with a one-year failure rate of around 12%. It is sprayed with spermicide and left on the cervix for at least six hours after sex. A healthcare provider's fitting is usually required.
When you breathe in, your diaphragm contracts (tightens) and flattens, causing it to move down towards your abdomen. This movement creates a vacuum in your chest, allowing it to expand (grow) and draw in air. When you exhale, your diaphragm relaxes and returns to its normal position as your lungs push the air out.
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Related Questions
How tall is the average male in North Korea?
Answers
Answer:
The average height of men in North Korea would be 170.7 cm (5ft 7in)
Explanation:
Because they are a different breed :)
Which of the following food groups is most commonly used as a source of high-protein hay, and as a nitrogen-rich green fertilizer, rather
than primarily as human food?
O alfalfa
O green beans
O peas
O soy beans
Answers
Help guys I have until 6 am tomorrow Describe the progression of the speciation process of Galapagos finches. Name each step (there are five), and describe each.
Answers
The Darwin's finches are an well-known illustration of an evolutionary change. About 2 million years ago, their common ancestor made their way to the Galapagos. The Darwin's finches over time have developed into 15 different species with distinct body sizes, beak shapes, songs, and feeding habits.
How did the Galapagos finches fare?Finches of Daphne Major, number 1 When there were fewer little seeds accessible to finches just on Galápagos island at Daphne Major around 1977 due to a drought, a significant number of small-beaked finches perished.
Galapagos finches: how did they develop?Finches evolved on the Galápagos Islands based on the diverse types of food available there; long, pointed beaks were useful for snatching insects, while broad, blunt snouts are excellent for breaking seeds and nuts.
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a dna is short sequence of single-stranded dna that is labeled with an isotope or tag and that can bind to a complementary dna region of interest. True or false
Answers
The given statement about a DNA probe being short sequence of single-stranded DNA that is labeled with an isotope or a tag and that can bind to a complementary DNA region of interest is indeed true.
DNA probes, also known as molecular probes, are short single-stranded DNA sequences with a specific base sequence that can be labeled with radioisotopes, fluorescent dyes, or other tags to detect complementary strands in a sample.
They can be used to detect, quantify, and isolate specific DNA sequences from a wide range of sources, including bacteria, viruses, animals, and plants.
DNA probes are used in a variety of applications, including gene expression analysis, mutation detection, and DNA sequencing.
They can also be used to diagnose genetic diseases, forensic analysis, and paternity testing, among other things.
When a DNA probe is added to a sample containing single-stranded DNA, it will seek out and bind to a complementary DNA sequence in the sample.
Depending on the probe's labeling, the location of the complementary strand can be determined by analyzing the radioactive decay pattern or fluorescence pattern.
This binding enables researchers to pinpoint specific DNA sequences within a complex mixture, allowing them to study the genetics of cells, diagnose diseases, and identify pathogens.
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HELP PLS: NEED ANSWER ASAPPPPPPPPPPPP <3
1. Explain acid deposition. Your explanation should include the following:
• The sources of acid deposition
• The chemical equations involved in acid deposition formation
• An explanation of the types of acid deposition
• A discussion of the effects of acid deposition
• A drawing that shows the sources, formation, and precipitation of acid deposition
Answers
Acid deposition, also known as acid rain or acid precipitation, refers to the deposition of acidic substances from the atmosphere onto the Earth's surface. It is primarily caused by emissions of sulfur dioxide (SO2) and nitrogen oxides (NOx) from human activities, particularly the burning of fossil fuels such as coal and oil in power plants, industrial processes, and vehicle emissions.
The chemical equations involved in acid deposition formation are as follows:
1. Formation of sulfuric acid (H2SO4):SO2 (sulfur dioxide) + O2 (oxygen) + H2O (water) → H2SO4 (sulfuric acid)
2. Formation of nitric acid (HNO3):NOx (nitrogen oxides) + OH (hydroxyl radical) → HNO3 (nitric acid)
Acid deposition can occur in two main forms: wet deposition and dry deposition.
1. Wet deposition: This occurs when acidic compounds in the atmosphere combine with water vapor to form acids that are then brought down to the Earth's surface through precipitation, such as rain, snow, sleet, or fog.2. Dry deposition: In this form, acidic compounds settle directly onto the Earth's surface without the involvement of precipitation. These compounds can be in the form of gases, particles, or dust, which are deposited onto plants, buildings, soil, and water bodies.The effects of acid deposition can be significant and wide-ranging:
1. Environmental impact: Acid deposition can acidify soil and bodies of water, leading to detrimental effects on aquatic ecosystems and plant life. It can harm fish, amphibians, and other aquatic organisms, as well as affect the pH levels and nutrient availability in soil, hindering plant growth.2. Damage to infrastructure: Acidic substances in acid deposition can corrode and damage buildings, statues, bridges, and other structures made of materials such as limestone, marble, and metals.3. Human health concerns: Acid deposition does not directly pose a significant health risk to humans. However, the pollutants that contribute to acid deposition, such as sulfur dioxide and nitrogen oxides, can contribute to respiratory problems and aggravate existing respiratory conditions in susceptible individuals.\(\huge{\mathfrak{\colorbox{black}{\textcolor{lime}{I\:hope\:this\:helps\:!\:\:}}}}\)
♥️ \(\large{\underline{\textcolor{red}{\mathcal{SUMIT\:\:ROY\:\:(:\:\:}}}}\)
I’m so confused, can someone help
Answers
Answer:
1) anti - B
2) anti - A
3) -----------
4) anti - A and anti - B
When your muscle cells do not get enough oxygen, fermentation can create?
Answers
Answer:
Your muscles are forced to work without enough oxygen. In these situations, your working muscles generate ATP anaerobically (i.e., without oxygen) using a process called fermentation. Fermentation is beneficial in that it can generate ATP quickly for working muscle cells when oxygen is scarce.
Explanation:
When oxygen is not present or if an organism is not able to undergo aerobic respiration, pyruvate will undergo a process called fermentation. Fermentation does not require oxygen and is therefore anaerobic. Fermentation will replenish NAD+ from the NADH + H+ produced in glycolysis.
Shawn wants to determine which species of bacteria and fungi live with bees. In a few sentences, describe a method you might use to identify the microbes.
Answers
Answer:
The correct answer is - DNA sequencing.
Explanation:
Microorganisms like Panteoa, Pseudomonas, and so on and fungal organisms resembling Aspergillus, Mucor, and Cladosporium, and others are explored in corbicular pollen and microbes stored in hive away honey bee bread.
With the assistance of the DNA sequencing technique, one can recognize these microorganisms. DNA sequencing is utilized to decide the arrangement of bases in a short section of a DNA of a creature. This examination compares and approved a reference database to create a percentage match with known micro organisms.
The method that identified the microbes is DNA sequencing.
The following information should be considered:
In the technique of DNA sequencing one could recognize the micro-organisms. It should be utilized for deciding the bases arrangement for the short section with respect to the creature DNA.The examination should compared & approved the database for developing the percentage match having well known micro-organism.
Therefore we can conclude that the method that identified the microbes is DNA sequencing.
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How are the phases of Venus different than the phase of our moon?
Answers
Answer:
Venus is an inferior planet. Because Venus is so close to the Earth and lies nearer to the Sun, it shows phases, similar to the way the Moon does. It also is closer to us near inferior conjunction (bigger) than at superior conjunction (smaller), and so its angular size changes as the distance between us varies.
Explanation:
18) The following are true characteristics of prokaryotic cells except A. Complex in cellular structure B. Are unicellular and extremely microscopic C. May occur singly, in pairs, chain and clusters. D. Members are from kingdom eubacteria and arcahaebacteria
Answers
A. Complex in cellular structure
Which type of nerve fiber conducts action potentials at the fastest speed? a. Type A fibers
b. Type B fibers
c. Type C fibers
d. Type D fibers
Answers
The type of nerve fiber that conducts action potentials at the fastest speed is Type A fibers (option a).
Type A fibers are characterized by their large diameter and myelination, which allows for rapid conduction of electrical signals.
Type A fibers are further divided into subtypes based on their specific conduction velocities. The fastest conducting fibers among Type A fibers are known as Aα fibers, followed by Aβ, Aγ, and Aδ fibers. These fibers are responsible for transmitting sensory information related to touch, proprioception, and motor signals.
Type B fibers (option b) and Type C fibers (option c) conduct action potentials at slower speeds compared to Type A fibers. Type B fibers are myelinated and transmit sensory information related to temperature and pain. Type C fibers are unmyelinated and carry slow pain and autonomic signals.
Type D fibers (option d) is not a recognized classification of nerve fibers and is not associated with specific conduction properties.
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what first aid can be given to the victim of flail chest?
Answers
The first aid for a victim of flail chest should involve the following steps:
1. Assess the situation: Ensure the safety of the victim and yourself. Check for responsiveness and if the victim is breathing.
2. Call for help: Dial emergency services immediately, as flail chest is a serious injury that requires professional medical assistance.
3. Stabilize the injury: While waiting for help to arrive, help the victim maintain a comfortable sitting or semi-sitting position. Avoid laying them down flat, as this can put pressure on the injured area and make breathing more difficult.
4. Apply the 3-point pressure technique: Place your hand over the flail segment, applying gentle pressure. The victim may also hold a pillow or cushion against their chest for support and to ease pain. This will help stabilize the chest wall, allowing for easier breathing.
5. Monitor the victim: Keep an eye on the victim's condition, ensuring they remain conscious and continue breathing. If they show signs of worsening distress, such as difficulty breathing, severe pain, or loss of consciousness, inform the emergency services of these changes.
Remember that first aid for flail chest is a temporary measure until professional medical help arrives. It is crucial to seek immediate medical attention for the victim to ensure proper treatment and care.
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neural signals that originate in the taste receptor cells and are transmitted via any one of the three relevant cranial nerves travel first to the:
Answers
Neural signals that originate in the taste receptor cells and are transmitted via any one of the three relevant cranial nerves travel first to the brainstem before being processed and relayed to other areas of the brain responsible for interpreting taste sensations.
Taste reception pathway refers to the series of events that occur when taste receptors in the tongue and other taste-sensitive tissues are stimulated by food molecules, resulting in the sensation of taste. The taste reception pathway involves several steps:
Activation of taste receptors: When food molecules come into contact with the taste buds on the tongue, they bind to specific taste receptors on the surface of taste cells. There are five basic tastes: sweet, sour, bitter, salty, and umami (savory).
Depolarization of taste cells: Binding of food molecules to the taste receptors triggers a series of chemical reactions that lead to the depolarization of taste cells. This depolarization generates an electrical signal that is transmitted to the brain via the taste nerve fibers.
Release of neurotransmitters: Depolarization of taste cells causes the release of neurotransmitters, such as ATP (adenosine triphosphate), which activate adjacent taste cells and stimulate further depolarization.
Transmission of signals to the brain: Taste nerve fibers carry the electrical signals generated by taste cells to the brainstem, where they are relayed to the gustatory cortex in the brain. The gustatory cortex is responsible for processing taste information and generating the sensation of taste.
Integration of taste with other senses: The perception of taste is also influenced by other senses, such as smell, touch, and vision. For example, the aroma of food molecules can influence the perception of taste, and the texture of food can affect the sensation of taste.
Overall, the taste reception pathway involves a complex interplay between the taste receptors, taste cells, neurotransmitters, nerve fibers, and brain structures, which work together to generate the sensation of taste.
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Facilitated diffusion requires
enzymes.
carrier proteins.
lipid carriers.
carbohydrate carriers.
lipid or carbohydrate carriers.
Answers
Facilitated diffusion requires carrier proteins. The membrane transport proteins known as carriers and channels fall into two categories.
What is carrier proteins ?In contrast to channel proteins, another type of membrane transport protein, which is less selective in transporting molecules, a carrier protein is a type of protein that moves a particular substance through intracellular compartments, into the extracellular fluid, or across cells.It is similar to an enzyme-substrate reaction in how a carrier protein moves a solute molecule across the lipid bilayer, and in many respects, carriers work like enzymes. However, unlike regular enzyme-substrate reactions, the carrier protein does not covalently modify the transported solute before delivering it to the other side of the membrane.There are one or more distinct binding sites for a solute in each type of carrier protein. By undergoing reversible conformational changes that alternately expose the solute-binding site on each side of the membrane, it moves the solute across the lipid bilayer.To learn more about carrier proteins refer :
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A frog population is split into two populations from the formation of a river. Over time
one of the frog populations become smaller and the other becomes larger. This
speciation is a result of what?
Answers
Answer:
That the lager frog population is better adapted to survive.
Explanation:
Here is an example: If you have to types of Polar Bears. Type 1 has long fur and type 2 has short fur. Which Polar Bear Type is more likely to survive in the north pole? Type 1, obviosity. The same goes for these frogs. Because one frog population is better adapted to survive than the other, it will allow the population to grow faster than the less adapted frogs.
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What are possible advantages for self-pollination to have evolved in a flowering plant species? select all that apply.
Answers
All the options are correct: The advantages of self - pollination include;
the plant species can survive in areas where animal pollinators are absent, the plant species tends to produce offspring that are more uniform compared to offspring resulting from outcrossing and less energy can be spent on attracting pollinator.What is pollination?Pollination is the transfer of pollen from an anther of a plant to the stigma of a plant, later enabling fertilization and the production of seeds, most often by an animal or by wind.
There are two main types of pollination:
Self pollinationCross pollinationWhat is self pollination?Self-pollination is a form of pollination in which pollen from the same plant arrives at the stigma of a flower or at the ovule.
Advantages of self pollination;The plant species can survive in areas where animal pollinators are absent.The plant species tends to produce offspring that are more uniform compared to offspring resulting from outcrossing.Less energy can be spent on attracting pollinator.Thus, the possible advantages for self-pollination to have evolved in a flowering plant species are; the plant species can survive in areas where animal pollinators are absent and less energy can be spent on attracting pollinator.
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The complete question is below:
What are possible advantages for self-pollination to have evolved in a flowering plant species? select all that apply.
-The plant species can survive in areas where animal pollinators are absent.
-The plant species tends to produce offspring that are more uniform compared to offspring resulting from outcrossing.
-Less energy can be spent on attracting pollinator.
TRUE/FALSE. The myogenic mechanism reflects the tendency of vascular smooth muscle to stretch.
Answers
The statement "The myogenic mechanism reflects the tendency of vascular smooth muscle to stretch." is false. The myogenic mechanism is a regulatory mechanism that helps to maintain blood flow and pressure in the body by adjusting the diameter of blood vessels.
It is a local, intrinsic mechanism that operates within the blood vessel wall, independent of the nervous or endocrine systems.
When a blood vessel is subjected to increased pressure or stretch, the smooth muscle cells in the vessel wall respond by contracting, which reduces the diameter of the vessel and helps to maintain blood flow and pressure.
Conversely, when pressure or stretch is decreased, the smooth muscle cells relax, allowing the vessel to dilate and increase blood flow. Therefore, the myogenic mechanism reflects the tendency of vascular smooth muscle to contract, rather than to stretch.
This mechanism plays a critical role in regulating blood flow and pressure in various organs, such as the kidney, brain, and heart, and is also involved in the autoregulation of blood flow during exercise or changes in posture. Therefore, the statement is false.
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which statement correctly describes most cinder cone volcanoes?
a) they are one of the tallest types of volcanoes.
b) they have a single,symmetrical cone at the top.
c) they often take thousands of years to form.
d) they emit lava that slowly spreads before cooling.
Answers
Statement correctly describes most cinder cone volcanoes are they have a single, symmetrical cone at the top
Cinder cones are the simplest type of volcano and they are built from particles and blobs of congealed lava ejected from a single vent and as the gas charged lava is blown violently into the air and it break into small fragments that solidify and fall as cinders around the vent to form circular cone and oval cone and a cinder cone is a steep conical hill of loose pyroclastic fragment and such as volcanic and clinkers and volcanic ash
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Answer:B
Explanation:
If the concentration of a solute is the same both inside and outside the cell, what might you expect with regard to its transport by a membrane protein?
Answers
If the concentration of a solute is the same both inside and outside the cell there will be no net transport Since there is no concentration gradient.
There won't be any net gain or loss of water from the cell if the concentrations of solutes inside and outside the cell are the same. An isotonic condition is one like this.When a region has a higher particle concentration than another, this is known as a concentration gradient. A concentration gradient will cause particles in passive transport to diffuse down it from higher concentration to lower concentration until they are evenly spaced.When molecules penetrate the membrane directly, the process is referred to as passive diffusion or simple diffusion. Molecules can move from a high concentration to a low concentration without using any energy thanks to the passive transport concentration gradient.learn more about concentration gradient here: https://brainly.com/question/19328396
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Since most forms of inherited color vision deficiency are recessive, postulate why color vision deficiencies would
not have been reduced to the point of disappearance. Specifically, in what ways could color vision deficiencies be
evolutionarily advantageous when compared to a population in which all people perceive the same colors?
Answers
Inherited color vision deficiencies are recessive. If both the parents are carriers of color vision deficiency genes, their child will inherit the trait. The carriers of these genes can perceive colors; however, they lack certain photopigments in their retina.
Due to the following reasons, color vision deficiencies would not have disappeared:
Color vision deficiencies are not life-threatening traits. Thus, they do not undergo natural selection. Color vision deficiencies occur with a low frequency (less than 8% of males have some form of color vision deficiency). Therefore, the carriers of these genes are not at a disadvantage from those who do not carry these genes. In some cases, color vision deficiencies could have an evolutionary advantage.
According to the hunter-gatherer hypothesis, individuals with red-green color vision deficiency were better able to detect prey in natural environments. Therefore, red-green color vision deficiency could be an evolutionary advantage compared to the population where all people perceive the same colors. It could be because the hunter-gatherer's deficiency can see through camouflage that may have been perfect for others with normal eyesight.
The carriers of color vision deficiency genes can see better through some color arrangements compared to people with normal vision. For instance, pilots with color vision deficiencies can see aircraft better than those with normal vision. Therefore, color vision deficiencies could be evolutionary advantageous when compared to a population in which all people perceive the same colors.
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On a hot day, warm air on land rises and collides with cool air. Which of these weather conditions is most likely to follow?
Question 21 options:
hurricane
blizzard
cyclone
thunderstorm
Answers
Answer:
thunderstorm i think
Explanation:
hope this helps :)
The numbers of organisms, at each trophies level, in a natural habitat remain more or less constant from year to year. Explain why this is so.
Answers
Predation: Both predator and prey species have balanced numbers, preventing any from becoming overly large and endangering the other.
Environmental factors: Variations in the environment, such as changes in temperature, precipitation, or sunlight, can have an impact on a species ability to survive and reproduce. The populations of creatures adapt and remain largely steady under a stable environment.
The overall number of species is largely maintained constant by this equilibrium. Competition can prevent a population from growing too large by limiting access to resources like food, water, and shelter.
Some species move to various environments in search of resources or to escape unpleasant circumstances. The movement of living things can support the balance of populations in various ecosystems.
Natural catastrophes: Natural catastrophes, like fires, floods, or earthquakes, can significantly affect populations of creatures. However, populations typically rebound and reach their baseline levels over time.
In conclusion, migration, competition for resources, environmental stability, predator-prey balance, and recovery from natural disasters all contribute to the stability of the population of species in a natural habitat from year to year.
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Photosynthesis vs. Respiration
Cellular Respiration and photosynthesis can be thought of as opposite processes. Energy
flows in opposite directions in the two processes.
Complete the table using the phrases listed below:
Green plant cells
CO,+H,O+ATP
Mitochondria
What Is Its purpose?
What type of cells do this?
What organelle in the cell
does this?
Reactants
Products
2. Which process:
Chloroplast
Glucose + O₂
Capture & Store energy
CO₂ + H₂O + light
1. Write the equation for each process:
a. Photosynthesis:
b. Respiration:
PHOTOSYNTHESIS
3. What type of energy:
a. Releases energy for the cell?
b. Stores energy for the cell?
Release energy from food
All cells
Glucose + O₂
RESPIRATION
a. Is used to make food during photosynthesis?
b. Is made during respiration?
4. How do the products of photosynthesis compare to the reactants of respiration?
Answers
1) Oxidative phosphorylation, which produces ATP using the energy released during the oxidation of the food we eat, is the traditional function of mitochondria. For the majority of biochemical and physiological processes, including growth, mobility, and equilibrium, ATP is used as the main energy source in turn. Almost every eukaryotic organism, including plants and animals, has mitochondria in its cells.
2) a) Photosynthesis: 6CO2 + 6H2O → C6H12O6 + 6O2.
b) Respiration: C6H12O6 + 6O2 → 6CO2 + 6H2O
3) a) Mitochondria Release energy for the cell.
b) carbon dioxide and water Is made during respiration.
4) Water and carbon dioxide are changed into oxygen and glucose during photosynthesis. The plant consumes glucose and produces oxygen as a byproduct. Oxygen and glucose are transformed into water and carbon dioxide during cellular respiration. By-products of the process include carbon dioxide, water, and ATP, which are turned into energy.
The main purpose of photosynthesis is to transform solar energy into chemical energy, which is then stored for later use. This mechanism primarily provides energy to the planet's life systems. The C3, C4, and CAM pathways are the three basic categories of photosynthetic pathways. They all use the Calvin cycle to convert CO2 into sugars, but each pathway does so in a somewhat different way.
Chloroplasts, which house the chlorophyll in plants, are where photosynthesis occurs. The thylakoid membrane, a third inner membrane that creates long folds inside the chloroplast and is bordered by a double membrane, is present inside chloroplasts.
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what is a hasty generalization in your own words
need help ASAP
Answers
Florida's land ecosystems include___________________. Check ALL that apply. *
prairies
forests
beaches
dunes
estuaries
Answers
Answer:
dunes, beaches, and maybe estuaries
Explanation:
i hope thats right.....
In a high latitude rainforest,the dominant type of photosynthesis is most likely to be
A) both C3 and CAM.
B) C4.
C) CAM.
D) both C4 and CAM.
E) C3.
Answers
The disadvantage of C4 photosynthesis is the additional energy, in the form of ATP, required to pump the 4-carbon acids to the bundle sheath cell and the 3-carbon complex back to the mesophyll cell for PEP production.
What kind of molecule makes up a photosystem's reaction center?A crucial chlorophyll molecule is located in the center. One of its electrons is elevated to a higher energy when it absorbs light. After passing through a number of other colored molecules and onto plastoquinone A, this supercharged electron moves downhill before crossing over to plastoquinone B.
Why do C4 plants thrive in tropical climates?For these plants, where the environment favors both water loss and the irritating photorespiration reactions caused by RUBISCO.
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what characteristics are affected by genetics?
Answers
Answer:
Well.
Explanation:
1. Weight
2. Height
3. Chronic Diseases
4. Skin color
5. Eye color
6. Race
7. Hair color
8. And the overall shape of your whole body (ie, head shape)
Answer:
The characteristics that are impacted by genetics are :
-The eye color
-The nose shape
-Hair color
-Face shape
-Skin color
-And any type of beauty mark someone has
WHAT IS IT ABOUT THE FUTURE THAT REQUIRES YOUNG PEOPLE TO UNDERSTAND A LOT ABOUT THE BROAD RANGE OF SUBJECTS?
Answers
The thing about the future which requires young people to understand a lot about the broad range of subjects is how there has been an increase in diversity and also to learn about all the possibilities.
What is a Subject?This is referred to as an area of knowledge or study, especially one that an individual studies at school, college, or university and examples include mathematics, science etc.
It is required for young people to understand a lot about the broad range of subjects because it makes the learn about all the possibilities in the different phenomenon and activities which takes place in the world.
It also increases their knowledge and exposure due to the way the world has become very diverse with new fields coming up thereby making it the correct choice.
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Alonso is studying for a test. In order to help understand the term cardioesophageal sphincter, he recalls that cardio
means "heart" and "esophageal" is related to the esophagus. This helps him to recall that the cardioesophageal sphincter
is the muscle closure at the end of the esophagus just behind the heart.
What technique is Alonso utilizing?
A participating in mock instruction
B analyzing diagrams
C breaking down terminology
D making flash cards
Answers
Answer: C) breaking down terminology
Explanation:
Nitrogen dioxide is a gas that can be generated by emissions from vehicles and factories. It can also be generated by natural sources, such as forest fires, lightning, and microbial activity in soil. The equation for producing nitrogen dioxide is shown below. Which of these provides evidence that a chemical reaction occurs?
Answers
Answer:
D. A brown gas produced
Explanation:
When a chemical reaction occur, there are several changes that takes place such as change in color, odor change, formation of a gas, and formation of a precipitate etcetera.
In the given chemical reaction, two colorless gas (NO and O2) react together and form brown gas (NO2). So, the change of gas from colorless to brown gas is the evidence that shows chemical reaction occurred.
Hence, the correct option is "D. A brown gas produced".