Answers
Demographers often focus on four primary elements when forecasting changes in population size: birth rates, death rates (life expectancy), the beginning age profile of the population (whether it is very elderly or relatively young to begin with), and migration.
What factors influence population growth throughout time?Change has three components: births, deaths, and migration. The population change caused by births and deaths is sometimes combined and referred to as natural rise or natural change. Populations increase or decline based on whether they gain more individuals than they lose.
First, the per capita population growth rate, which is the rate at which population size changes per individual in the population, influences population size.
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Related Questions
If you are going to allow a population of mice to randomly mate for 5 generations and you want to limit inbreeding to a maximum of 14.678481% after generation 5 (assuming you started with zero inbreeding), how many males do you need if you have 20 females?
a) 5
b) 10
c) 50
d) 2
e) 8
Answers
The answer is (b) 10. To limit inbreeding to a maximum of 14.678481% after 5 generations, we need to calculate the expected amount of inbreeding in each generation and then adjust the number of males to add to the population accordingly.
The expected amount of inbreeding in each generation can be calculated using the formula:
Expected inbreeding = (1 - (1/2)^(generation/2)) * (1 - (1/2)^(generation/2)^2) * ... * (1 - (1/2)^(generation/2)^(14))
Substituting the value of generation=5 gives:
Expected inbreeding = (1 - (1/2)^5) * (1 - (1/2)^5)^2 * ... * (1 - (1/2)^5)^(14)
= 0.81924005762932
The maximum amount of inbreeding allowed is 14.678481%. Substituting this value gives:
Maximum inbreeding = 14.678481 / 0.81924005762932
= 17.5937535396166
Therefore, to limit inbreeding to a maximum of 14.678481% after 5 generations, we need to add at least 17.5937535396166 males to the population.
Solving for the number of males needed if we have 20 females, we get:
17.5937535396166 = (20 * 1 - 14.678481) / 20
= 3.45344278981875
Rounding to the nearest whole number, we get:
The number of males needed is 3.
Therefore, the answer is (b) 10.
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which of the following is a primary role for vitamin k in the body? a. muscle contraction b. enzyme action c. nerve transmission d. blood clotting
Answers
Answer:
d. blood clotting
Explanation:
The primary role of vitamin K in the body is blood clotting. Vitamin K is essential for the proper function of certain proteins involved in the blood clotting process. Deficiencies of vitamin K can lead to abnormal bleeding and increased risk of bleeding disorders.
Behavior of Light
White Light composed of several different colors. When it hits the shell of the bug only red color is
from the surface of the shell and therefore
we see a red shell. All the other colors are
by the bug's shell. However, the dark spots on the shell surface are regions where white light
was
Answers
The principles of reflection, absorption, and transmission can be used to describe how light behaves in various situations. when an object's surface is illuminated by white light, which includes every colour in the visible spectrum.
Light, which looks white, is composed of various colors, just like the hues of the rainbow.Since it contains all wavelengths, white light, also known as polychromatic light, is literally made up of every colour of the rainbow. This is best illustrated by the light from a lantern or the Sun. Because laser light is monochromatic, it only emits one hue.
When white light strikes an object, what occurs to the colour of light?A white item will evenly reflect all shades of white light. If When an item absorbs all colours except for one, we can still see that colour. Red, orange, green, blue, indigo, and violet light are all absorbed by the yellow strip in the accompanying illustration.
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How many organs does a Human have?
need full sentences
Answers
Answer:
78
Explanation:
Answer:
Humans have 78 organs.
Explanation:
Bones and teeth are each counted once. Counting each bone and tooth separately increases the organ list to 315 organs. Counting every ligament and tendon would also dramatically increase the total number of organs.
Challenges of moving from an aquatic to a terrestrial environment You have the pleasure of observing wood frog tadpoles in a pond on campus. You see them make the transition from gilled larvae into adults with lungs. In order to make this amazing transformation from an entirely aquatic life to one that includes time on land, your tadpoles will face a series of obstacles, not unlike those that the first vertebrate inhabitants of land faced. Complete the following sentences to correctly examine those changes.
circulatory system Because of their large________ , ancestral amphibians likely faced challenges supporting themselves out of the aquatic environment.
cartilaginous bones feeding Although there was far_________ oxygen available to gills in air than in water, the delicate structure of gills couldn't be supported in the terrestrial environment.
excretory system The costs of locomotion on land and greater oxygen demand from enlarged muscles led to modifications of the heart and_________
body size
more These early amphibians could not venture too far away from water because______ was restricted to moist environments.
less
egg deposition
Answers
Answer:
body size
more
circulatory system
egg deposition
Explanation:
Because of their large body size , ancestral amphibians likely faced challenges supporting themselves out of the aquatic environment.
Although there was far more oxygen available to gills in air than in water, the delicate structure of gills couldn't be supported in the terrestrial environment.
The costs of locomotion on land and greater oxygen demand from enlarged muscles led to modifications of the heart and circulatory system
These early amphibians could not venture too far away from water because egg deposition was restricted to moist environments.
Which is a limiting nutrient for plant growth?
water
nitrogen
carbon
oxygen
Answers
Answer:
Nitrogen
Explanation:
Nitrogen and phosphorus are among the elements considered most limiting to plant growth.
Hope it helps!
The limiting nutrient for plant growth is:
B. Nitrogen
Others are needed for the growth of plants.
Nutrients for plant growth:Supplement lacks can present genuine dangers to establishing efficiency, supplements can become poisonous in abundance, which is likewise dangerous. Whenever a few micronutrients gather to extremely undeniable levels in plants, they add to the age of responsive oxygen species (ROS), which can cause broad cell harm.
The nutrient that is required in a minimum amount for plant growth is Nitrogen.
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As a polypeptide is being translocated across the membrane of the endoplasmic reticulum, a stop-transfer sequence can halt the process. What eventually becomes of this stop-transfer sequence?.
Answers
A stop-transfer sequence can interrupt the translocation of a polypeptide across the endoplasmic reticulum membrane. It creates a protein segment that spans a -helical membrane.
What is a simple definition of a polypeptide?Polypeptide: a peptide made up of at least two amino acids. Proteins are constructed from amino acids, which combine to form polypeptides.
What role does the polypeptide play?Polypeptides. Proteins are created by joining several amino acids together to form polypeptides. The bonding of two or more polypeptides results in the formation of proteins, which are then folded into the appropriate shape.
What components make up polypeptide?an amino acid-containing polypeptide. A chain of amino acids joined together by covalent (peptide) bonds makes up each polypeptide.
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Which features make capillaries great for
exchanging substances between the
blood & cells? (select all that apply)
the blood pressure is much lower & the flood
flows slower, allowing time for exchange
they are permeable & allow substances
in/out
they have a very large total cross sectional
area for the exchange
they are only one cell layer thick
Answers
Answer:
All of the following features make capillaries great for exchanging substances between the blood and cells:
The blood pressure is much lower and the flow is slower, allowing time for exchange
They are permeable and allow substances to move in and out
They have a very large total cross-sectional area for exchange
They are only one cell layer thick, which facilitates rapid diffusion of substances across their walls.
Explanation:
how is desertification related to civilization
Answers
Answer:
Human activities that relate and contribute to desertification include use and expansion of agricultural lands, poor irrigation practices, and deforestation. These land uses place enormous pressure on the land because it alters its soil chemistry.
Explanation:
How does the concentration of enzymes affects the reaction?
Answers
Enzymes play a significant role in catalyzing metabolic reactions that occur in living cells. These reactions involve the transformation of substrate molecules into a new form called products. In addition, enzyme catalysis is affected by the concentration of enzymes as well as that of substrates.
Enzyme concentration has a significant effect on the rate of the reaction. The number of enzymes present determines how many substrate molecules will be transformed into product per unit time.In the absence of enzymes, the reaction proceeds at a slow rate, and at high concentrations of enzymes, the reaction rate increases. If there are insufficient enzymes to react with the available substrates, the reaction rate will slow down until all the enzymes react with the substrates. However, when the enzyme concentration is too high, there may be excess enzymes that are unable to react with the substrates.Therefore, an optimum enzyme concentration is required for maximum reaction rate. At the optimum enzyme concentration, all the enzymes are working at their maximum velocity to react with the substrates. Thus, the concentration of enzymes plays a crucial role in the rate of enzymatic reactions.
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t/f during an infection with listeria, an intracellular bacterium, apcs will present antigen on mhc ii molecules.
Answers
During an infection with Listeria, an intracellular bacterium, antigen-presenting cells (APCs) will present antigen on MHC II molecules, the given statement is true because Listeria monocytogenes is a Gram-positive, intracellular bacterium that can cause severe foodborne infections, particularly in immunocompromised individuals.
Once inside the host, Listeria is engulfed by phagocytic cells such as macrophages and dendritic cells, which serve as APCs. APCs process and present the bacterial antigens to the immune system by displaying them on their MHC II molecules. This presentation is crucial for activating the adaptive immune response, specifically T-helper cells. These T-helper cells then interact with the MHC II-antigen complex, promoting the release of cytokines that aid in coordinating the immune response.
In addition to MHC II presentation, Listeria can also be presented on MHC I molecules through a process called cross-presentation. This mechanism allows the activation of cytotoxic T-lymphocytes (CTLs) to target and eliminate Listeria-infected cells. Overall, the presentation of Listeria antigens on MHC II molecules by APCs plays a critical role in the host's immune response against this intracellular bacterium.
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Once the cell has gone through interphase, it is ready for division. What is this process called?
Cellular Respiration
Mitosis
G0
S phase
Answers
Answer:
S phase
Explanation:
During the interphase which is also called the S phase, the cell duplicates its chromosomes and ensures its systems are ready for cell division. If all conditions are ideal, the cell is now ready to move into the first phase of mitosis.
chapter 9 what is the primary organ of gas exchange for the fetus?
Answers
The primary organ of gas exchange for the fetus is the placenta.
The placenta is an organ that develops during pregnancy and connects the developing fetus to the uterine wall to allow for the exchange of nutrients, oxygen, and waste products between the mother and the developing fetus. Oxygen from the mother's blood diffuses across the placenta and into the fetal blood, while carbon dioxide from the fetal blood diffuses across the placenta and into the mother's blood for elimination. The placenta also plays a role in the production of hormones that help to maintain the pregnancy and prepare the mother's body for childbirth.
During pregnancy, the fetus relies on the mother for the exchange of gases and nutrients, and the placenta plays a crucial role in facilitating these exchanges. The placenta is a disc-shaped organ that develops early in pregnancy and attaches to the lining of the mother's uterus. The placenta contains blood vessels that carry the mother's blood, and the fetal blood circulates through a network of blood vessels that run parallel to those of the mother. The fetal blood is separated from the maternal blood by a thin membrane called the placental barrier, which allows for the exchange of gases, nutrients, and waste products between the two circulations.
The fetal blood is rich in carbon dioxide and other waste products and has a low oxygen concentration, while the maternal blood is high in oxygen and other nutrients. Oxygen from the maternal blood diffuses across the placenta and into the fetal blood, while carbon dioxide from the fetal blood diffuses across the placenta and into the maternal blood for elimination. The placenta also produces hormones such as estrogen and progesterone, which help to maintain the pregnancy and prepare the mother's body for childbirth.
In summary, the placenta is the primary organ of gas exchange for the fetus, allowing for the exchange of oxygen and carbon dioxide between the fetal and maternal blood, as well as the exchange of nutrients and waste products. It also plays an important role in producing hormones that support the pregnancy.
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AGAIN PLEASE DON'T ATTACH A LINK
Which statement best describes a bacterial cell?
А. It contains more than one cell.
B. It is a complete organism.
С. It is part of a larger organism.
D. It contains different kinds of cells.
Answers
if all cells contain the exact same copy of DNA, how do they become specialized?
Answers
Even if all the cells have the same DNA they biochemical function are different, that's because differents sets of genes must be turned on and off in each cell type by the action of enzymes and other molecules. Each cell have the same 20,000 or so genes but they are biochemically selected by the action of molecules as hormones and chemical signaling. Therefore, different cells use different parts of the DNA code as directions.
Pain relievers, anti-inflammatories, antivirals, and antihistamines all manage what
Answers
Pain relievers, anti-inflammatories, antivirals, and antihistamines all manage: inflammation.
What is inflammation?An indication of inflammation may occur when a wound grows, gets red, and aches. The body's immune system reacts to an irritant by causing inflammation, to put it very simply. A splinter in the finger or other foreign item, such as a bacterium, might possibly be the source of the irritation.
Aulus Cornelius Celsus, a Roman physician, wrote about the four primary symptoms of inflammation in the first century AD. These symptoms include redness (Latin rubor), heat (calor), swelling (tumor), and pain (dolor).
Science has shown that persistent, low-grade inflammation can become a silent killer that fuels type 2 diabetes, cancer, cardiovascular disease, and other illnesses.
Thus, pain relievers, anti-inflammatories, antivirals, and antihistamines all manage: inflammation.
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Hydras are animals related to coral and jellyfish. Hydras can reproduce sexually or asexually. Why would hydras avoid reproducing asexually when conditions are difficult?
Responses
Reproducing more slowly would be a good way to take advantage of plentiful resources.
Reproducing more slowly would be a good way to take advantage of plentiful resources.
The high genetic diversity could mean that all of the hydras die, depending on the situation.
The high genetic diversity could mean that all of the hydras die, depending on the situation.
The lack of genetic diversity could mean that all of the hydras die, depending on the situation.
The lack of genetic diversity could mean that all of the hydras die, depending on the situation.
Reproducing more rapidly would be a good way to take advantage of plentiful resources.
Answers
Reproducing more slowly would be a good way to take advantage of plentiful resources for hydras.
What are hydras ?Small, fragile, elongated sea anemones are what hydras resemble. They have a fundamentally bag-like body that is columnar or trunk-like. There are numerous lengthy tentacles around the mouth's edge. The thickness of hydra bodies is merely two cell layers. Hydras are able to adhere to surfaces thanks to a sticky substance at their foot. Hydras can bend down and perform somersaults in slow motion, or they can glide slowly on their feet. Both sexual and asexual methods are used by hydra for reproduction. When asexual reproduction occurs, the bud grows on the parent body, receives sustenance from the parent body as it matures, and then separates from the parent body. So, option A is correct.The complete question is :
Hydras are animals related to coral and jellyfish. Hydras can reproduce sexually or asexually. Why would hydras avoid reproducing asexually when conditions are difficult?
A. Reproducing more slowly would be a good way to take advantage of plentiful resources.
B. The high genetic diversity could mean that all of the hydras die, depending on the situation.
C. The lack of genetic diversity could mean that all of the hydras die, depending on the situation.
D. Reproducing more rapidly would be a good way to take advantage of plentiful resources.
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Will give Brainliest
How do similarities in body structure provide evidence for evolution?
Answers
Answer:
comparative anatomy
Explanation:
they both provide evidence for evolution homologous structures are structures that are similar in related organisms because they were inherited from a common ancestor the structures are similar because they evolved to do the same. Not because they were inherited from a common ancestor
Both provide evidence for evolution. Homologous structures are structures that are similar in related organisms because they were inherited from a common ancestor. ... The structures are similar because they evolved to do the same job, not because they were inherited from a common ancestor.
If
some energy depletion produces a positive change, does it follow
that more energy depletion is always better? why or why not
Answers
No, more energy depletion is not always better because there is a threshold beyond which excessive depletion can lead to negative consequences such as environmental degradation and imbalance in ecosystems.
No, it does not follow that more energy depletion is always better, even if some instances of energy depletion can produce positive changes.
Threshold Effect: Energy depletion can have positive effects up to a certain point. For example, extracting a limited amount of fossil fuels can provide energy for human needs. However, once the threshold is crossed, further depletion can lead to negative consequences such as environmental pollution, climate change, and resource depletion.Ecological Impact: Energy depletion often involves the extraction and utilization of natural resources, which can have detrimental effects on ecosystems. Increased depletion can disrupt ecological balance, harm biodiversity, and lead to the degradation of habitats and ecosystems.Sustainable Alternatives: Relying solely on energy depletion is not sustainable in the long run. It is important to shift towards renewable and clean energy sources that have minimal environmental impact, such as solar, wind, and geothermal energy. This reduces the need for further energy depletion and promotes a more sustainable energy future.Environmental Considerations: Energy depletion is often associated with negative environmental externalities, including air and water pollution, deforestation, and habitat destruction. These environmental impacts can have far-reaching consequences for human health and well-being.Therefore, while some instances of energy depletion may bring short-term benefits, it is crucial to consider the long-term sustainability and potential negative impacts. Striving for a balance between meeting energy needs and preserving environmental integrity is essential for the well-being of both current and future generations.
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How do you know the molecule below is an unsaturated fat?
A. The molecule has an OH group on the end.
B. The molecule contains carbon double bonds.
C. The molecule has no nitrogen atoms.
D. The molecule contains a carbon-oxygen double bond.
Answers
Answer:
The molecule contains carbon double bonds.
Explanation:
took the test
What is one difference between a meteoroid and an asteroid?
Meteoroids revolve around the Sun just like planets and asteroids do not.
Meteoroids are smaller than asteroids.
Asteroids are smaller than meteoroids.
Asteroids revolve around the Sun just like planets and meteoroids do not. (its science)
Answers
Answer:
Meteoroids are smaller than asteroids.
Explanation:
Your friend John is having trouble with his compost bin. The material in his
compost pile doesn't seem to be decomposing well. You take a sample of
the pile and check for the presence of microorganisms under the
microscope. You see that there are indeed microorganisms; however, they
don't appear to be growing very fast. John says that he regularly mixes his
compost pile to expose it to oxygen but has noticed the pile feels cold.
What is the most likely explanation for this problem? (1 point)
A. The compost pile was placed in the sunshine.
B. The compost pile was sufficiently moist.
C. The compost pile contained aerobic bacteria.
D. The compost pile contained incorrect amounts of "greens"
and "browns"
Answers
The lack of greens and browns in the compost pile is the most likely cause of John's issue. The correct option is D.
Thus, the terms greens and browns refer to materials with a high nitrogen content, such as food scraps and grass clippings, and a high carbon content, such as leaves and twigs. Both of these ingredients must be in balance for a compost pile to be effective.
If the pile has too many browns, it will take longer for it to disintegrate, and if it contains too many greens, it will get too damp and smelly. If the ratio of greens to browns is off, the decomposing microbes will not flourish, creating a slow, chilly compost pile.
Thus, the ideal selection is option D.
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what is the main reason for using a data table to collect data?
Answers
Answer:
the correct awnser is a to understand better
Answer:
the correct answer is a because tables make data easier to understand
Help please!
What’s is the water doing, is it a process or resevoir.
Answers
Answer:
It looks like it would be a process, though I have never answered this question. Sorry if it’s wrong!
Explanation:
This photo looks like the water-cycle, and as I can remember using my background knowledge; the water cycle is a process.
define cell theory for class 9
plz answer
Answers
Answer:
A theory in biology that includes one or both of the statements that the cell is the fundamental structural and functional unit of living matter and that the organism is composed of autonomous cells with its properties being the sum of those of its cells.
Explanation:
anyone know the answer?
Answers
Answer:
Tidal current
Answer:
Your answer is: Tidal Current
Explanation:
What is the purpose of control in an experiment?
Answers
Answer:
An experimental control is used in scientific experiments to minimize the effect of variables which are not the interest of the study. The control can be an object, population, or any other variable which a scientist would like to “control.”.
Explanation:
all of the following are polysaccharides except group of answer choices cellulose in certain cell walls. agar used to make solid culture media. glycogen in liver and muscle. prostaglandins in inflammation. a cell's glycocalyx.
Answers
Cellulose in certain cell walls Prostaglandins in inflammation. The correct option is Prostaglandins .
Here's a brief explanation of the other options:
1. Cellulose in certain cell walls: Cellulose is a polysaccharide that is a major component of plant cell walls. It is composed of glucose monomers and provides structural support to plants.
2. Agar used to make solid culture media: Agar is a polysaccharide derived from red algae. It is used as a solidifying agent in microbiological culture media due to its gel-like properties.
3. Glycogen in liver and muscle: Glycogen is a polysaccharide that serves as an energy storage molecule in animals. It is primarily found in the liver and muscles and is composed of glucose monomers.
4. A cell's glycocalyx: The glycocalyx is a carbohydrate-rich layer on the cell surface, consisting of glycoproteins and glycolipids. It may contain polysaccharides, which can be involved in various cellular functions, such as cell adhesion and communication.
In contrast, prostaglandins are not polysaccharides. They are a group of lipid compounds derived from fatty acids, and they play essential roles in inflammation and other physiological processes.
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Describe how deflected succession can act as a conservation technique:
Answers
Deflected succession can be a useful conservation technique to maintain biodiversity and prevent habitat loss.
Deflected succession involves manipulating natural processes of ecological succession to create and maintain a particular type of ecosystem. For example, this technique can be used to create and maintain grasslands or other open habitats that would otherwise be lost to forest succession. By using controlled disturbances such as prescribed burning or grazing, it is possible to maintain an ecosystem in a state that promotes the persistence of certain species or communities. Deflected succession can be used in a variety of settings, including grasslands, wetlands, and forests. Overall, this technique can help to promote biodiversity, maintain rare or threatened species, and prevent habitat loss.
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the wind is a renewable energy source name one more renewable energy source used to generate electricity
Answers
Answer:
Water
Explanation:
Water is a renewable energy source used to generate electricity. A place where this happens at is dams.
Answer:
Water
Explanation:
Water is a renewable energy source used to generate electricity. A place where this happens at is dams.