What 2 biotic factors compete for the same abiotic factor in a forest ecosystem
Answer:
Plants, animals.
They both require/need water, therefore, they both compete for water.
The two biotic factors are the plants and animals which compete for the same abiotic factor like water in a forest ecosystem.
What are the biotic and abiotic factors in an ecosystem?An ecosystem comprises two prime constituents, that is, abiotic factors and biotic factors. The living part of the ecosystem like animals and plants are considered as biotic factors. On the other hand, the non-living components of the ecosystem like water, minerals, and light are considered as abiotic factors.
In the case of forest ecosystem, the prime biotic factors like animals and plants are totally dependent upon the abiotic factors like water for their existence. Both plants and animals require water for their growth and development.
Thus, the two biotic factors in a forest ecosystem are plants and animals, and they compete for the same abiotic factor like water.
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The energy released when sugar molecules are
broken down is stored in
(1) minerals
(3) DNA
(2) ATP
(4) wastes
Answer:
The energy released when sugar molecules are broken down is stored in ATP
Explanation:
Answer:
Atp
Explanation:
Rank the following technical skills from the most basic to the most advanced.
perform an MRI, repair an EEG machine, read patient charts, calibrate microscopes
read patient charts, perform an MRI, calibrate microscopes, repair an EEG machine
read patient charts, calibrate microscopes, perform an MRI, repair an EEG machine
repair an EEG machine, read patient charts, calibrate microscopes, perform an MRI
Answer:
read patient charts, calibrate microscopes, perform an MRI, repair an EEG machine
Answer:
the answer is c- reading patient charts, calibrate microscopes, perform an mri, repair an eeg machine
Explanation:
just did the unit test review, hope this helps <3
Muscle cells in your arm are not able to conduct nerve impulses. It is the job of neurons to conduct nerve impulses. This is an example of:
Answer:
Specialization
Explanation:
Is is the adaptation of an organ or part to serve a special function or to suit a particular way of life.
"The correct term for this example is "cellular specialization."
Cellular specialization refers to the process by which cells develop specific structures and functions to perform particular tasks within an organism. In this case, muscle cells in the arm are specialized for contraction and movement, while neurons are specialized for conducting nerve impulses. This division of labor among different cell types allows for the efficient functioning of the body's tissues and organs.
Muscle cells contain proteins such as actin and myosin that enable them to contract when stimulated by a nerve impulse. However, they do not have the necessary structures to generate and propagate nerve impulses. Neurons, on the other hand, have specialized cellular components like axons and dendrites that are designed to transmit electrical signals throughout the body. The neurons' ability to conduct nerve impulses is crucial for coordinating muscle movement, as well as for all other nervous system functions.
In summary, the fact that muscle cells cannot conduct nerve impulses and rely on neurons to do so is a clear example of how different cells within a multicellular organism have distinct roles, a concept known as cellular specialization."
A force is a
A. push B. pull C. Both A and B D. Neither A nor B
Answer:
C.
because a force is what causes an object to move
two major pieces of information can be determined from analyzing a karyotype of an unborn child
Answer:
i need points sorry
Explanation:
What type of inheritance is ABO Blood groups?
Answer:
The inheritance of ABO blood groups corresponds to an autosomal codominant pattern.
Explanation:
The blood type is defined by the presence of surface antigens in the red blood cell, called A and B. The presence of each antigen is determined by a gene present on the parental chromosomes.
Blood type A corresponds to the presence of gene A, and its genotypic expression can be A/A or A/O. Type B blood, whose genotype is B/B or B/O, is due to the presence of a gene containing the B antigen. AB blood -due to codominance- has one gene for A and another for B, with genotype A/B. Blood type O, characterised by the absence of surface antigens, behaves like a recessive trait, which only manifests itself in the absence of surface antigens A and B. The genotype is O/O.The presence of an antigen A or B, suppresses the expression of blood type O, recessive, which will be possible only in its homozygous form.
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Final answer:
ABO blood groups are inherited via a system involving multiple alleles and codominance. The IA and IB alleles are codominant and dominant over the i allele. Offspring of heterozygous type A and type B parents can have any of the four blood types.
Explanation:
Inheritance of ABO Blood Groups:
The ABO blood groups are an example of inheritance that involves multiple alleles and codominance. The alleles IA and IB are responsible for types A and B blood, respectively, and both are dominant over the allele i, which is responsible for type O blood. In cases where an individual inherits one allele for type A (IA) and one allele for type B (IB), they exhibit a phenotype known as type AB blood, in which both antigens are expressed equally on the surface of red blood cells.
For a heterozygous blood type A parent with genotype AO (IAi) and a heterozygous blood type B parent with genotype BO (IBi), there is a possibility their offspring can have any of the four blood types: A, AB, B, or O. This variety is due to the alleles segregating during formation of gametes and then coming together to form the genotype of the offspring.
Because the tilt of Earth’s axis always points in the same direction, the seasons in the Northern and Southern Hemispheres are always ___?
Answer:
Opposite
Explanation:
If its summer in the northern hemisphere it is winter in the southern.
Because the tilt of Earth's axis always points in the same direction, the seasons in the Northern and Southern Hemispheres are always opposite.
The Earth has a constant axial tilt of 23.5 degrees, with the axis always pointing towards Polaris, the North Star, as it orbits the Sun. When the Northern Hemisphere is tilted towards the Sun during its orbit, it experiences summer, with longer days and shorter nights. Conversely, the Southern Hemisphere, being tilted away from the Sun at the same time, experiences winter, with shorter days and longer nights. This tilt and the Earth's orbit around the Sun lead to the different seasons experienced by each hemisphere throughout the year. Acting out the Earth's revolution around a lamp in a dark room while leaning in the same direction can be a helpful illustration for students to understand this concept.
Which statement supports the following conclusion?
Genetic modification of foods is beneficial to society.
A. Most of the foods we eat have been genetically modified.
B. Genetically modified foods are heartier and healthier.
C. modification tacks on an added cost to foods.
D. Some genetic modification leads to unintended consequences.
The statement 'Genetically modified foods are heartier and healthier' is in favor of genetic modification (Option B).
What are genetically modified foods?Genetically modified foods (GMOs) are foods that have been modified by genetic engineering techniques.
These foods (GMOs) raise different concerns regarding the safety of such products for human health.
In conclusion, the statement 'Genetically modified foods are heartier and healthier' is in favor of genetic modification (Option B).
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1. Why does sand settle to the bottom of a jar
faster than mud does?
2. What is sediment?
1. Sand particles are too big to dissolve so their density sinks them
2. Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice or by the force of gravity acting on the particles.
The human disease phenylketonuria has symptoms that include mental problems, chronic skin rashes, and reduced hair and skin pigmentation. Phenylketonuria can be caused by a mutation in a single gene.
Phenlyketonuria is an example of pleiotropy. Based on this, it can be concluded that pleiotropy occurs when
A.
a single gene influences multiple traits.
B.
a trait is influenced by both genes and environment.
C.
a trait is not influenced by genes.
D.
a single trait is influenced by many genes.
Answer:
The human disease phenylketonuria has symptoms that include mental problems, chronic skin rashes, and reduced hair and skin pigmentation. Phenylketonuria can be caused by a mutation in a single gene.
Phenlyketonuria is an example of pleiotropy. Based on this, it can be concluded that pleiotropy occurs when a single gene influences multiple traits.
Explanation:
The correct answer is option( A), a single gene influences multiple traits, exemplified by phenylketonuria where a mutation in the PAH gene leads to various symptoms, showcasing pleiotropy.
Pleiotropy is a genetic concept where a single gene can have multiple effects on an organism's phenotype. This means that one gene can influence several different traits. In the case of phenylketonuria, a mutation in a single gene (the PAH gene, which encodes the enzyme phenylalanine hydroxylase) leads to a variety of symptoms, including mental problems, chronic skin rashes, and reduced hair and skin pigmentation. This illustrates how one gene can have a pleiotropic effect, causing a range of distinct symptoms.
Let's consider the other options to understand why they are incorrect:
B. a trait is influenced by both genes and environment.
This option describes the concept of gene-environment interaction, where the expression of a trait is determined by both genetic and environmental factors. While this is an important aspect of genetics, it does not describe pleiotropy.C. a trait is not influenced by genes.
This statement is incorrect because almost all traits are influenced by genes to some extent. Even traits that are heavily influenced by the environment have some genetic component.D. a single trait is influenced by many genes.
This option describes polygenic inheritance, where a single trait is affected by multiple genes. While this is also an important concept in genetics, it is not an example of pleiotropy, which involves one gene affecting multiple traits.Therefore, the definition that best fits the concept of pleiotropy, as exemplified by phenylketonuria, is that a single gene influences multiple traits."
Thomas is studying the daily electric power used by his town. He has summarized the power consumption of his town over the course of an average day in the which of the following inferences could Thomas make?
Answer:
Thomas is studying the daily electric power used by his town. He has summarized the power consumption of his town over the course of an average day in the which of the following inferences could Thomas make?
Thomas could simply infer the total amount of electric power consumed averagely in a day for his home town which might be multiplied to get a total for a week, month or entire year
Explanation:
Describe and contrast four different mechanisms of movement in four different classes of protists, Amoeba, Paramecium, Euglena, and Diatoms.
Answer:
Amoeba: Amoeba moves with the help of pseudopodia. The pseudopodia are known as false feet of the amoeba as they are actually protrusions of the cytoplasm.
Paramecium: Movement in the paramecium is assisted by the cilia, which are hair like projections covering the outer body of the paramecium. The movement of the cilia moves the paramecium body forward or backwards.
Euglena: Movement in Euglena is assisted by structures called flagellum. The flagellum are a thread like structure which causes whipping movement in euglena.
Diatoms: DIatoms have structures called raphe for movement. It allows the diatoms to move over surfaces.
what are sex chromosomes
Answer:
sex chromosome is a type of chromosome responsible for the chromosomal determination of the sex of an individual, example whether a female or a male. Humans and most other mammals have two sex chromosomes, the X and the Y. Females have two X chromosomes in their cells, while males have both X and a Y chromosomes in their cells. Egg cells all contain an X chromosome, while sperm cells contain an X or Y chromosome. This arrangement means that it is the male that determines the sex of the offspring when fertilization occurs.
Tracy mixed cyclohexane and ethanol in a test tube. Calculate the angle of refraction of 26.8° light shines from the ethanol into the cyclohexane. The indices of refraction for cyclohexane and ethanol are 1.43 and 1.37, respectively.
Answer:25.4
Explanation:because i got it correct
To find the angle of refraction when light passes from ethanol to cyclohexane, you use Snell's Law with the given indices of refraction and the angle of incidence. Calculate sin(θ2) and then use the inverse sine function to find the angle of refraction (θ2).
Explanation:To calculate the angle of refraction of light passing from ethanol into cyclohexane, we can use Snell's Law, which is n1 × sin(θ1) = n2 × sin(θ2), where n1 and n2 are the indices of refraction of the two media, and θ1 and θ2 are the respective angles of incidence and refraction. Given that the index of refraction of ethanol (n1) is 1.37 and that of cyclohexane (n2) is 1.43, and the angle of incidence (θ1) is 26.8°, we can solve for the angle of refraction (θ2).
Applying Snell's Law:
1.37 × sin(26.8°) = 1.43 × sin(θ2)
First, calculate the sine of the angle of incidence and then divide by the index of refraction for cyclohexane to find the sine of the angle of refraction:
sin(θ2) = (1.37 × sin(26.8°)) / 1.43
After calculating sin(θ2), use the inverse sine function to determine the angle θ2, which is the angle of refraction.
Substitute the values into the equation and solve for the angle of refraction (calculations not shown here as they require a calculator).
This image shows the RBCs of a person with sickle cell anemia, an inherited condition. What effects could the shape of these cells have on the efficiency of the circulatory system?
Answer:
The shape of the abnormal red blood cells in sickle cell anemia can affect the efficiency of the circulatory system by obstructing the flow of blood through the arteries.
Explanation:
Red blood cells are the cells responsible for transporting oxygen and carbon dioxide throughout the body, and their spherical shape allows them to pass through blood vessels of any calibre.
A red blood cell in sickle cell disease loses its spherical shape, acquiring a half-moon shape, which can lead to its accumulation inside the arteries and produce a blockage, decreasing the efficiency of the circulatory system.
The arterial obstruction may lead to a decrease in oxygenation in the sites that are irrigated by that artery.
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Answer:
Because the cells are sickle shaped, their surface area is decreased. These RBCs likely cannot carry oxygen as effectively as regular blood cells. The shape can cause the cells to get stuck in the blood vessels, creating a blockage.
Explanation:
The formation of ova, or female reproductive cells, occurs when diploid germ cells undergo meiosis. In female swamp wallabies (Wallabia bicolor), diploid germ cells contain 101010 chromosomes.
At the beginning of meiosis I, a female wallaby germ cells contains
Choose 1 answer:
(Choice A)
A
10 homologous pairs of chromosomes comprising a total of 20 chromatids
(Choice B)
B
5 homologous pairs of chromosomes comprising a total of 20 chromatids
(Choice C)
C
10 homologous pairs of chromosomes comprising a total of 10 chromatids
(Choice D)
D
5 homologous pairs of chromosomes comprising a total of 10 chromatids
Answer:
(Choice B) 5 homologous pairs of chromosomes comprising a total of 20 chromatids.
Explanation:
Homologous chromosome are those two chromosomes which have same gene but different in shape and appearance.
Chromatids are the identical copies of chromosome. Single chromosome splits into double number of chromatids. In 5 pairs, 10 chromosomes are present so 10 chromosomes splits into 20 chromatids.
The beginning of meiosis I in female swamp wallabies contains 5 homologous pairs of chromosomes, totaling 20 chromatids.
The correct answer is:
(Choice B) B. 5 homologous pairs of chromosomes comprising a total of 20 chromatids.
In female swamp wallabies, which have a diploid chromosome number of 10 (10 pairs of chromosomes), at the beginning of meiosis I, the germ cells contain homologous pairs of chromosomes. Meiosis I is the first stage of meiosis, where homologous chromosomes pair up and undergo crossing over, resulting in genetic recombination.
Since the swamp wallabies have 10 pairs of chromosomes, this means they have 5 homologous pairs. Each homologous pair consists of two chromosomes (paternal and maternal), and during meiosis I, these homologous pairs align and exchange genetic material. Therefore, each chromosome consists of two chromatids due to DNA replication during interphase before meiosis I begins.
So, at the beginning of meiosis I, a female wallaby germ cell contains 5 homologous pairs of chromosomes, comprising a total of 20 chromatids (2 chromatids per chromosome × 10 chromosomes). This configuration allows for genetic variation and the production of genetically diverse ova, essential for reproductive success and species survival.
Once cells with nuclei developed, organisms were able to become more complex, which allowed them to adapt to the conditions in more habitats. By which process do organisms adapt and evolve?
Answer:
Organism tend to adapt and evolve through natural selection.
Explanation:
Natural Selection can be described as a phenomenon by which those organisms are favored and selected by nature which are better adapted to live in an environment. These organism are able to reproduce and pass on their favorable traits to their offspring. Through natural selection, evolution occurs with the passage of time as those traits which are more suited to the ecosystem start existing in organisms.
Final answer:
Organisms adapt and evolve through the process of evolution. Evolution involves mutations that produce new traits, which are then acted upon by natural selection, allowing well-adapted traits to become prevalent in a population. Multicellular organizations such as eukaryotes evolved cells with specialized functions, leading to increased complexity and adaptability.
Explanation:
Organisms adapt and evolve through the process of evolution, which is characterized by gradual change in a population over time. This can lead to the emergence of new species from older ancestral species.
Mutations are random changes in an organism’s hereditary material that can result in new traits. Some mutations can enhance an organism’s ability to survive and reproduce in a particular environment. Natural selection, or 'survival of the fittest,' then acts on these traits. Organisms that are better adapted to their environment tend to survive and produce more offspring, spreading the advantageous traits through the population.
As multicellular organisms, such as eukaryotes, became more complex, they developed the ability to specialize their cells and organize them into tissues, organs, and systems. This specialization and organization allow for greater efficiency and the ability to maintain homeostasis. Over time, this complexity has enabled organisms to inhabit a wide variety of habitats on Earth.
What is wrong with genetic engineering in humans?
Answer:
People being scared of becoming inferior .
Explanation:
Once someone has become genectically altered they might have some advantages up on regular humans that don't want to be genetically altered. The unaltered humans would always be scared of being attacked by the altered humans . Its the superhero scenario. In comics you see some humans fear superman because he has the power to kill all of them & that leads to that one guy developing weapons (lex luthor) to try and level the playing field.
How does the genetic makeup of the skin cells differ from the genetic makeup of the of the gametes?
The cells of skin are somatic cells undergo mitosis while gametes are germ cells are and undergo meiosis.
Explanation:
The cells of the skin are somatic cells while the gametes are the germ cells which become haploid.
The cells of the skin undergo mitosis for the growth and repair process.
The germ cells or gamete undergo meiosis to produce haploid cells.
The skin cell when undergoes mitosis forms 2 diploid cells and gametes undergoes meiosis to form haploid cell.
The haploid cell on fusing with sperm or ovum becomes diploid by making a zygote.
The number of chromosomes in skin cell or somatic cell have complete set of chromosomes i.e. 46 in human while the cells of gamete will be half the chromosome as 23.
The half information of the individual is present in gamete whereas skin cell have full information.
Answer:
Gametes transfer all genetic information to the next generation, so their DNA is somewhat "protected" from somatic cells
Explanation:
Gametes differ from other cells in the body in several ways: the cells we call as "somatic." Think about what a gamete has to do, what is different from most other cells, and you will begin to discover many cellular differences. For example, gametes must become haploid: they must reduce their genetic material to a single copy, while somatic cells are diploid. Gametes go through a process of gene reduction called meiosis, and only gametes do. Furthermore, gametes transfer all genetic information to the next generation, so their DNA is somewhat "protected" from somatic cells. Furthermore, gametes, especially eggs, can produce a completely new organism. No other somatic cell (that we know of) can do this naturally (although some stem cell research is focused on solving this problem). There are many other differences, but these should help you get started. Again, consider linking function, what cells do, to their shape.
2 Points
What is a hominid?
O A. Any ancestor of humans
O B. Any bipedal animal
O C. Any species formed by evolution
O D. Any bipedal primate
SUBMIT
Answer:
The answer is D. Any bipedal primate
Explanation:
Hominids are also known as Great Apes, which are part of the Primate order. All Hominids have the ability to walk upright, which is known is bipedalism. Therefore, hominids are organisms that are bipedal primates.
What type of rna is produced in the nucleus
Answer:
mRNA
Explanation:
Messenger RNA produced in the nucleus and go to the cytoplasm. In cytoplasm two other types of RNA ribosomal and transfer RNA present that read the sequence of mRNA and produce protein molecule.
What tools give scientist the best data to study ice loss near the poles?
A.Satellite measurements
B. Argo floats
C. Air bubbles trapped in ice
D. I’ve core samples
Satellite measurements give scientist the best data to study ice loss near the poles. So, the correct option is (A).
What is Satellite temperature measurement?Satellite temperature measurements are defined as the temperature of the atmosphere at different altitudes as well as the sea and land surface temperature obtained from radiometric measurements by satellites.
Satellites do not measure temperature directly because they measure radiation in different wavelength bands, which must be mathematically inverted to obtain indirect references to temperature, where the resulting temperature profiles are used to derive temperature from radiation which depend on the details of the methods involved.
Thus, Satellite measurements give scientist the best data to study ice loss near the poles. So, the correct option is (A).
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The correct option is A i.e. Satellite measurements
Satellite measurements, air bubbles trapped in ice, and ice core samples are essential tools for studying ice loss near the poles.
Scientists can analyze ice loss near the poles with the greatest data available thanks to satellite monitoring. These instruments allow for precise and continuous monitoring of ice sheets and glaciers from a distance.Air bubbles trapped in ice also play a crucial role in studying past climate conditions. By analyzing the composition of these bubbles, researchers can gather important information about temperature and atmospheric conditions in the past.Ice core samples provide a direct record of historical climate data. By drilling into ice sheets, scientists can extract cores that contain valuable information about past environmental conditions and fluctuations.similarities and differences between these two topics. Compare and contrast the
usefulness of scientific research on our society with the usefulness of space research on
our lives on Earth
Scientific research and space research both contribute significantly to human knowledge and technological advancement. However, scientific research, covering diverse fields, more directly impacts daily lives, including health and environmental sustainability. Space research, while often viewed as abstract, provides unique benefits, including technological applications like GPS, weather prediction, comprehension of our universe, and a backup survival plan for humanity.
Explanation:Both scientific research and space research have immense importance for our society. Similarities between these two stem from the fact that they both push the boundaries of human knowledge, bring technological advancements, and have potential to radically improve our lives.
However, their usefulness differs in context. For instance, scientific research revolves around various fields such as medicine, physics, chemistry, etc., producing insights which directly affect our everyday lives (such as development of new medicines or sustainable technologies). On the other hand, space research, while sometimes seen as a more abstract application of science, delivers distinctive benefits. It leads to the development of new technologies (GPS, weather prediction, broadcasting) that we commonly use, contributes to our understanding of the universe, and even provides a contingency plan for human survival in case the conditions on earth become unsustainable.
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Would you say glucose or sucrose is more complex why
Sucrose is considered more complex than glucose because it is made up of two different sugar molecules bonded together.
Explanation:Glucose and sucrose are both carbohydrates, but they have different structures and properties. Glucose is a monosaccharide, which means it consists of a single sugar molecule. Sucrose, on the other hand, is a disaccharide composed of two monosaccharides - glucose and fructose - bonded together. In terms of complexity, sucrose is considered more complex than glucose because it is made up of two different sugar molecules.
what is pollution that does not come from a single source known as
A. Nonpoint source pollution.
B. Nonpoint source solutions
C. point source pollution.
D. point source solutions
QUESTIONS
1. What are the two main threats to African elephant populations?
Scientists estimate that African elephants are being lost at a rate of Iday.
Answer:
1) Escalating poaching, or illegal killing, for the commercial trade in ivory and meat.
2) Growing demands of exploding human populations and poverty.
The main threats to African elephant populations are poaching, driven by the high demand for ivory, and habitat loss due to human activities such as deforestation and expansion of agricultural lands.
Explanation:The two main threats to African elephant populations are poaching and habitat loss. Poaching is a significant threat primarily due to the demand for elephant ivory, especially in Asia. Elephants are often killed to harvest their tusks, which can sell for high prices on the black market. The second major threat is habitat loss, caused largely by human activities such as deforestation and expanding agricultural land use. As the habitat of elephants shrinks, they come into more frequent contact with humans, often leading to conflicts.
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Which of these is a positive effect of climate change on organisms?
O
A. Reduces atmospheric oxygen
O
B. Provides new habitats
O
C. Reduces niche size
O
D. Increases ocean acidity
SUBMIT
Answer:
Provides new habitats
Explanation:
AP!X STUDENTS
The positive effect of climate change on organisms is that it provides new habitats. The correct option is B.
Climate change can lead to changes in temperature, precipitation patterns, and other environmental conditions.
These changes may lead to the establishment of new habitats or modifications to existing habitats, which may have an influence on many creatures in both good and negative ways. In this instance, the beneficial outcome is the creation of new habitats.
As climate patterns shift, certain regions may become more suitable for certain species or ecosystems.
For example, as temperatures warm in certain areas, species that were previously limited by colder temperatures may be able to expand their ranges or colonize new areas.
This expansion of suitable habitats can provide opportunities for increased biodiversity and ecological resilience.
Thus, the correct option is B.
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Which property of oceans best explains why they have a major effect on climate?
A.
They hold a large amount of heat energy.
B.
They have a constant tidal movement.
C.
They absorb gases from the atmosphere.
D.
They contain large amounts of dissolved salt.
Answer:
It's A.
Explanation:
They hold a large amount of heat energy
Answer:
A.
They hold a large amount of heat energy.
Explanation:
Oceans are of magnificent at taking up heat generated from m the sun and keeping it. If the Oceans were poor at it, the heat would be confined as a result of the greenhouse activity impact and it results to certain changes in the climate such as making it extremely hot. Through this process, oceans take in massive proportion of heat and successfully decreases the total temperature of the world.
The growth rate of a population is the amount by which a population's size changes in a given time. In which of the following ways
are immigration and birth rate similar in regards to a population's growth rate?
A.
Both immigration and births add individuals to a population
B.
Neither immigration nor births occur when a population has reached its carrying capacity
C.
Neither immigration nor births occur if a population has limiting factors
D.
Both immigration and births subtract individuals from a population
Reset
Submit
Immigration and birth rate are similar in that they both contribute to the increase of a population's growth rate by adding individuals.
Explanation:The growth rate of a population is influenced by several factors: births, deaths, immigration, and emigration. When comparing immigration and birth rate, both concepts are similar in that they add individuals to a population. This is represented in calculations of growth rate where immigration and births are factors that are added to quantify an increase in the population size. On the contrary, deaths and emigration are factors that are subtracted as they represent a decrease in the population size. The growth patterns may follow exponential or logistic models, the former describing unfettered growth, while the latter accounts for environmental limitations.