the very earliest forms of life probably .
A. manufactured their own food supply by photosynthesis
B. required an external food supply
C. were similar to present-day anaerobic bacteria
D. manufactured their own food supply by chemosynthesis
Answers
The very earliest forms of life probably manufactured their own food supply by chemosynthesis. The correct answer is D.
The earliest forms of life on Earth are believed to be microscopic organisms that lived in hydrothermal vents, which are deep-sea openings where hot, mineral-rich water flows out of the Earth's crust.
These organisms were able to manufacture their own food supply by chemosynthesis, a process in which they used the energy from chemical reactions to produce organic compounds.
Photosynthesis, the process by which plants use sunlight to produce food, did not evolve until later in the history of life on Earth. This is because the early Earth's atmosphere was very different from the atmosphere today, and it did not contain enough oxygen to support photosynthesis.
The earliest forms of life were also very different from the life that exists today. They were simple, single-celled organisms that did not have a nucleus or other organelles. They were also anaerobic, meaning that they did not require oxygen to survive.
Therefore, the correct option is D, manufactured their own food supply by chemosynthesis.
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Related Questions
That faces are somewhat special visual stimuli is supported by all these findings except that:
Select one:
a. babies prefer stimuli with vertical (left/right) symmetry over those with horizontal (up/down) symmetry.
b. babies only a few days old prefer to look at the faces of their own mother over other age-matched female faces.
c. we are better at recognizing previously seen faces than other types of visual stimuli.
d. even very impoverished line drawings can be interpreted as faces.
e. babies prefer to look at faces over other stimuli
Answers
The faces are some what special visual stimuli that are supported by most of the findings except that babies prefer stimuli with vertical (left/right) symmetry over those with horizontal (up/down) symmetry. The remaining options (b, c, d, e) are consistent with the concept that faces are unique visual stimuli.
Babies only a few days old prefer to look at the faces of their mother over other age-matched female faces. It suggests that infants have an innate preference for the unique features of human faces, which distinguishes them from other objects and faces.
Therefore, all of the options given (except option a) support the idea that faces are unique visual stimuli that are processed using a distinct neural mechanism. These findings suggest that humans have an innate preference for faces and that our ability to recognize and remember them is better than for other types of visual stimuli.
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a legal blinding agrement between two parties like a buyer and seller
Answers
Answer:
huh
Explanation:
A purchase agreement (also called a sales contract) is a binding contract between two parties (property buyer and property seller) to transfer a particular property. This contract specifies the details regarding the sale of a property.
__________ glands are flask-shaped, with short ducts that usually open into a hair follicle and directly onto to skin.
Answers
Sebaceous glands are glands found in the skin of mammals, including humans.
They are flask-shaped and typically have short ducts that open into hair follicles or directly onto the skin. These glands produce an oily substance called sebum, which helps to lubricate and protect the skin and hair. Overproduction of sebum can lead to conditions such as acne, while underproduction can cause dry skin. The activity of the sebaceous glands is regulated by hormones, particularly androgens, which increase their activity during puberty. The glands also play a role in the development of skin conditions such as seborrheic dermatitis and rosacea. Sebaceous glands are skin glands that produce sebum, an oily substance that lubricates and protects skin and hair. Overproduction can cause acne, while underproduction can lead to dry skin. They are regulated by hormones, particularly androgens, and play a role in skin conditions such as seborrheic dermatitis and rosacea.
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What is produced when depolarization of a cell membrane reaches threshold?
Answers
When depolarization of a cell membrane reaches the threshold, an action potential is produced. Here's a step-by-step explanation:
1. Depolarization occurs when positive ions, such as sodium (Na+), enter the cell, causing a change in the cell membrane's electrical potential.
2. As the cell membrane depolarizes, it moves towards a less negative or even positive electrical potential.
3. The threshold is a specific level of depolarization needed to trigger an action potential.
4. When depolarization reaches the threshold, voltage-gated ion channels open, allowing more ions to flow across the cell membrane.
5. This rapid exchange of ions causes a spike in the electrical potential, producing an action potential.
6. The action potential propagates along the cell membrane, ultimately leading to the transmission of signals in neurons or the contraction of muscle cells.
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How did it infect the human population
Answers
Answer:
How did what effect the human population? then i'lll be able to help you.
Explanation:
How does cell volume affect nutrient exchange between the cell and its external environment.
Answers
Answer:
The ratio of cell volume to surface area determines the efficiency of nutrient exchange.
Explanation:
determines the efficiency of nutrient exchange.
1. Complete a dichotomous key for the 10 leaves on the Common Leaves sheet. The chart provided here allows for 11 pairs of statements. Depending on how you build your dichotomous key, you may or may not need all of them, or you may need to add some.
Statement Types/Dichotomous key for leaves Identification Name/Number of Leaves
Statement 1a Click or tap here to enter text.
go to statement or identify leaf Click or tap here to enter text.
Statement 1b Click or tap here to enter text.
go to statement or identify leaf Click or tap here to enter text.
Answers
This dichotomous key should help you identify the leaves on the Common Leaves sheet by asking a series of yes/no questions and directing you to the appropriate leaf based on your answers.
Sure! Here's a dichotomous key for the 10 leaves on the Common Leaves sheet:
1a. Leaves are needle-like or scale-like (go to Statement 2)
1b. Leaves are not needle-like or scale-like (go to Statement 3)
2a. Leaves are arranged in clusters (go to Statement 4)
2b. Leaves are not arranged in clusters (go to Statement 5)
3a. Leaves are broad and flat (go to Statement 6)
3b. Leaves are not broad and flat (go to Statement 7)
4a. Clusters of leaves have 2 needles (go to Leaf 1)
4b. Clusters of leaves have more than 2 needles (go to Leaf 2)
5a. Leaves are feathery and fern-like (go to Leaf 3)
5b. Leaves are not feathery and fern-like (go to Statement 8)
6a. Leaves are heart-shaped (go to Leaf 4)
6b. Leaves are not heart-shaped (go to Statement 9)
7a. Leaves have a sawtooth edge (go to Leaf 5)
7b. Leaves do not have a sawtooth edge (go to Statement 10)
8a. Leaves have rounded lobes (go to Leaf 6)
8b. Leaves do not have rounded lobes (go to Statement 11)
9a. Leaves have a waxy texture (go to Leaf 7)
9b. Leaves do not have a waxy texture (go to Leaf 8)
10a. Leaves have deeply cut lobes (go to Leaf 9)
10b. Leaves do not have deeply cut lobes (go to Leaf 10)
Leaf 1: White Pine
Leaf 2: Red Pine
Leaf 3: Maidenhair Fern
Leaf 4: Sweetgum
Leaf 5: Red Maple
Leaf 6: Sugar Maple
Leaf 7: Magnolia
Leaf 8: Dogwood
Leaf 9: Oak
Leaf 10: Ginkgo
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When a person sees a doctor about a respiratory illness, the doctor will want to determine if the sickness is in the
upper respiratory tract or the lower respiratory tract. The starting point for the lower respiratory system is the
trachea.
Which structures are part of the upper respiratory system? Select three options.
the larynx
0
the bronchus
the alveoli
the lungs
the pharynx
The nose
Answers
Answer:
its below
Explanation:
The major passages and structures of the upper respiratory tract include the nose or nostrils, nasal cavity, mouth, throat (pharynx), and voice box (larynx)
Look at each picture. Then write in the term that best completes each sentence:
cross-pollination dominant
genetic information
recessive
1. Offspring cells are
identical to parent
cells because they
contain identical ____
2. The pea plant in
this picture is polli-
nating another
plant. This process is
called ______
3. In pea plants, the
allele for purple
flower color is ______
4. Pea plants with
white flowers receive
two __________
over the allele for
white flower color.
alleles for flower
color from parents.
Answers
Answer:
the answer is C. The plant received both alleles from both the parents.
Explanation:
please please please help
Answers
Answer:
i think its like this ok
a) its one of number one so put d) the other number one
Explanation:
there are the one the oly i understand :) hope you help in something
acnh how to duplicate flowers do you have to open animal crossing every day in order for them to duplicate
Answers
In the event that you water a solitary flower that isn't straightforwardly close to one more flower of a similar sort, that flower can copy, or "clone" itself. The clone is indistinguishable from the original flower.
To begin with, pick the flower you need to clone. Planting hybrid flowers is the smartest option, as they can clone themselves and likewise draw in the most extraordinary bugs to them. Then, at that point, find a spot on your island that is Not even close to some other plants. This is important, as the hybrid flower needs space to clone itself and NOT cross with different flowers.
Once planted, make a point to water your hybrid flower. Watering the flower sets off the hybrid cycle and since there could be no different flowers close to it for it to cross with, the flower ought to just clone itself over and over.
Animal Crossing players have had incredible accomplishment with this strategy. On the off chance that you plant a flower close by its other relatives it could cross with those and make hybrid flowers of a similar kind. Assuming that you plant the flower alone, it will rather create clones. The key is to be patient and water the flowers, and give it close to up to 14 days for those to blossom into their clones and hybrids.
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In trying to classify a newly discovered organism, the following characteristics were noted: multicellular, complex, autotrophic with cell walls. Into which kingdom should this organism be placed and why?
A.
Into the kingdom Eubacteria because the organism is complex, multicellular and cannot make its own food
B.
Into the kingdom Animalia because the organism is complex, multicellular and cannot make its own food
C.
Into the kingdom Fungi because the organism is multicellular and has chlorophyll allowing them to produce their own food
D.
Into the kingdom Plantae because it is multicellular, contains cell walls, and has chlorophyll allowing them to produce their own food
Answers
Answer: Hope this helps!
Explanation: D
Answer:
d
Explanation:
get finnesed my abd bro
True or false: the food chain of land animals begins with the soil
Answers
Answer:
True
Explanation:
The primary producers are the first trophic level of the soil food web. Organisms in this trophic level are photosynthesizers, including plants, mosses, algae, lichens and photosynthetic bacteria. ... Primary consumers obtain energy by eating primary producers or the residues they produce.
Hope this helps :)
Explain how you will prioritize tasks in the medical office by immediate, essential, or optional. How will you re-prioritize when disruptions occur?
Answers
prioritizing tasks in a medical office, I would first categorize them into three groups: immediate, essential, and optional. Immediate tasks such as emergencies or critical patient needs.
Essential tasks are those that must be completed within a certain time frame, such as lab results or patient follow-up. Optional tasks are those that can be completed at a later time, such as scheduling appointments or ordering supplies. To prioritize these tasks, I would first focus on immediate tasks, followed by essential tasks and then optional tasks. When disruptions occur, such as a last-minute emergency, I would re-prioritize tasks by reassessing the situation essential and determining which tasks need to be completed first. For example, if a patient is experiencing a severe allergic reaction, I would prioritize their care over any other task.
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PLSSS HELP I WILL MARK BRAINLIEST I TRULY NEED HELP IM GONNA FAIL
You are an anthropologist analyzing bone remains from the grave of an ancient female human. Within one of the bones, you find an unusually high concentration of collagen. What does this suggest about the ancient female? (2 points)
She broke a bone and then died before it was fully healed.
She broke a bone and then died a few hours later.
She broke a bone at a very young age, but it fully healed.
She broke a bone at a very young age, but it did not fully heal.
Answers
Answer: C
Explanation:
the structure that is located anatomically between the aorta and the left ventricle is the
Answers
Answer:
aortic valve
Explanation:
The structure that is located anatomically between the aorta and the left ventricle is the aortic valve.
Hope this helps!
How is oxygen carried from the lungs to the tissues?
a. It is carried by cilia through the bronchioles.
b. It binds to a protein called hemoglobin in red blood cells.
c. It leaves the alveoli and enters mucus.
d. It leaves the bronchi and enters capillaries.
Answers
Answer:
Oxygen transport within the human body occurs through both convection and diffusion. ... Oxygen diffuses from both the alveoli into the pulmonary capillaries and the systemic capillaries into the tissues, according to Fick's laws of diffusion and the random walk of the diffusing particles
Explanation:
Hope this helps
Answer: It binds to a protein called hemoglobin in red blood cells.
Explanation:
Haemoglobin (Hb) is a protein found in the red blood cells that carries oxygen in your body and gives blood its red colour.
please help this is due tomorrow.
Answers
Answer: A) The power he used to move the boxes can be found by determining the rate at which work was done on the boxes.
Answer: D) The power of the light Chad turned on is the amount of energy transferred per time.
Hope this helped. ,’:)
the reaction that is carried out by the enzyme catalase produces __________.
Answers
describe in your own words, the formation of our solar system.
Answers
Answer:
Explanation:
our solar system formed about 4.5 billion years ago from a dense cloud of interstellar gas and dust. The cloud collapsed, possibly due to the shockwave of a nearby exploding star, called a supernova. When this dust cloud collapsed, it formed a solar nebula—a spinning, swirling disk of material.
hope it helped
plzzzz mark as brainliest
The small intestine receives food from the _____.
rectum
large intestine
stomach
liver
Answers
ignore this (hehheushsh)
Sedimentary rocks form from rock and mineral fragments, and metamorphic rocks form from existing rock.
True
Or False
Answers
Answer:
True
Explanation:
Sedimentary - A rock formed as a result of the weathering process, either by compaction and cementation of rock mineral fragments, or the precipitation of dissolved minerals.
Metamorphic - These rocks form as existing rocks are subjected to intense heat and/or pressure, usually over long periods of time.
2. Which of the following is evidence used to support cell theory? (Choose all that apply)
Cells from different organisms have similar parts.
All living and nonliving things are made of cells.
I Animals are made from cells, but plants are not.
All plants and animals are made of cells.
Answers
Describe the difference in MPS (and hypertrophy) with overfeeding in an untrained/obese group compared to a group of trained individuals.
Answers
In an untrained/obese group, overfeeding can lead to an increase in muscle protein synthesis (MPS) and hypertrophy, but the response may be blunted compared to a group of trained individuals.
Trained individuals generally have a higher baseline level of MPS and muscle mass, which may limit the extent of MPS and hypertrophy in response to overfeeding.
In an untrained or obese group, overfeeding can provide an excess of nutrients, including protein, which can stimulate MPS and promote muscle hypertrophy. However, several factors may affect the response to overfeeding in this group. Untrained individuals may have lower baseline levels of MPS and muscle mass compared to trained individuals, which can limit the potential for substantial increases in MPS and hypertrophy.
Additionally, obesity is associated with metabolic dysregulation, such as insulin resistance and chronic inflammation, which can negatively impact muscle protein metabolism. These metabolic disturbances can impair the anabolic response to overfeeding and limit the extent of MPS and hypertrophy.
On the other hand, trained individuals who regularly engage in resistance exercise have already established a higher baseline level of MPS and muscle mass. Their muscles are more sensitive to the anabolic stimuli of overfeeding and may exhibit a greater response in terms of MPS and hypertrophy. Trained individuals also tend to have better metabolic health, which can further enhance the muscle protein synthesis response to overfeeding.
In summary, while both untrained/obese individuals and trained individuals may experience increases in MPS and hypertrophy with overfeeding, the response in the untrained/obese group may be blunted due to lower baseline levels of MPS, metabolic dysregulation, and impaired muscle protein metabolism. Trained individuals, with their higher baseline levels of MPS and muscle mass, may exhibit a more pronounced response to overfeeding in terms of MPS and hypertrophy.
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A shielded nucleus will absorb ______ from a deshielded nucleus and will have a ______ chemical shift.
Answers
A shielded nucleus will absorb upfield from a deshielded nucleus and will have a lower chemical shift.
What in NMR is shielded or deshielded?
When the electron density around the nucleus is high in NMR, the magnetic field that opposes the electrons is likewise increased, providing significant shielding. Deshielding occurs when the nucleus's surrounding electron density decreases, the magnetic field that is obstructing it weakens, and the nucleus begins to sense more of the external magnetic field.
Radiation shielding is the insertion of a protective shield between an ionizing radiation source and the object to be protected in order to lessen the potential harm to sensitive or biological components, particularly during transport.
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which statement best describes the function of stem cells in the bone marrow?
Answers
The statement that best describes the function of stem cells in the bone marrow is that they produce red and white blood cells and platelets. Bone marrow contains stem cells, which are undifferentiated cells capable of self-renewal and differentiation into various types of cells, including red and white blood cells and platelets.
Bone marrow is responsible for producing blood cells and is the site of hematopoiesis (the process of forming blood cells). Stem cells differentiate into red blood cells, white blood cells, and platelets. Red blood cells transport oxygen to tissues, while white blood cells fight off infection and disease. Platelets help in blood clotting.
The bone marrow transplant is a medical procedure that replaces unhealthy stem cells with healthy ones. This can treat certain types of cancer, like leukemia and lymphoma, as well as other blood disorders. In conclusion, the primary function of stem cells in the bone marrow is to produce red and white blood cells and platelets.
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Which does not take place in the mitochondria of the cell?
A. Carbon dioxide is produced
B. Hydrogen ions cross a membrane
C. Glucose is broken down into organic compounds
D. The ATP synthesis enzyme combines adp and phosphate
explain your answer
Answers
Answer: C: Glucose is broken down into organic compounds
Explanation: Glucose is breaking down into organic compounds occurs in the cytosol of the cell
hope this helps :)
Amal was on a picnic to Hatta with his parents and family friends. While playing, he collected some muddy water from the Wadi in his beaker, which he wanted to make pure and clean. A) What do you think will happen to the mud in his beaker if left overnight? B) What is this process called?
Answers
Answer:
See the answers below
Explanation:
A) The mud in Amal's beaker will settle down at the bottom of the muddy water if left overnight with clear water occupying the surface. This is because the particles of mud are insoluble in water and will settle down at the bottom of the muddy water if left undisturbed for a while.
B) The process is called sedimentation. The settled mud particles are referred to as the sediments and the clear water at the top can be decanted off to separate the sediment from the water.
this answer i need pls ill mark brainliest
Answers
All - growth, exchange of gases, excretion, reproduction, and death (option d).
All living organisms undergo various life processes to maintain their existence. Let's analyze each option to determine which life processes are carried out by an organism's cells:
A. Only growth and exchange of gases: While cells are involved in growth and exchange of gases, they also participate in other life processes. This option is incomplete.
B. Only growth, exchange of gases, and reproduction: Cells play a crucial role in reproduction as they are responsible for the production of gametes and the process of cell division. However, there are additional life processes that cells also undertake.
C. Only growth, exchange of gases, excretion, and reproduction: This option includes excretion in addition to growth, exchange of gases, and reproduction. Cells participate in excretion by eliminating waste materials. However, there is one more life process that cells experience.
D. All - growth, exchange of gases, excretion, reproduction, and death: This option encompasses all the mentioned life processes. Cells are involved in growth as they undergo cell division and increase in number. They exchange gases through processes like respiration. Cells excrete waste products. They participate in reproduction through the formation of gametes and cell division. Lastly, cells also experience death as they have a limited lifespan.
Therefore, the correct answer is D. All - growth, exchange of gases, excretion, reproduction, and death.
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Microorganisms that found in food can be classified based on
nutrien
protein, lipids and carbohydrates Elaborate this
statement.
Answers
Microorganisms that are found in food are classified into three types; carbohydrates, proteins, and lipids based on the nutrient they consume.
These nutrients are found in food and are required by microorganisms to survive and grow. The Microorganisms that feed on carbohydrates are referred to as carbohydrate fermenters which convert carbohydrates into energy by breaking down the sugars found in carbohydrates. Some examples of carbohydrate fermenters include yeast, lactic acid bacteria, and acetic acid bacteria.
Microorganisms that feed on proteins are referred to as protein decomposers. They break down the proteins found in food into amino acids and use them as a source of energy. Examples of protein decomposers include proteolytic bacteria and fungi.
The microorganisms that feed on lipids are referred to as lipid decomposers. They break down the fats found in food into fatty acids and glycerol, which they then use as a source of energy. Examples of lipid decomposers include lipolytic bacteria and fungi.
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