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Can you please help me with my sciene homework.. I don’t understand it and i can’t find it in the text book
1. A _____ is the role an organism plays in the ecosystem.
a habitat
b symbiosis
c population density
d niche
2 _____ is the largest number of individuals of a species that an environment can support and maintain for a long period of time.
a Population size
b Limiting factor
c Carrying capacity
d Symbiosis
3 The number of individuals in a population is the population’s _____.
a carrying capacity
b size
c density
d spacing

1. The number of individuals in a population is the population’s _____. (1 point)
carrying capacity
size
density
spacing
2. _____ is the largest number of individuals of a species that an environment can support and maintain for a long period of time. (1 point)
Population size
Limiting factor
Carrying capacity
Symbiosis
3. A _____ is the role an organism plays in the ecosystem. (1 point)
habitat
symbiosis
population density
niche

Thomas Malthus’s 1798 work, Essay on the Principle of Population, greatly influenced Darwin. Which of the following statements best summarizes Malthus’s idea?
A) Animals are able to pass to their offspring characteristics that were acquired in their lifetimes.
B) Individuals that can run faster are more likely to survive and pass their genes to the next generation.
C) Isolated populations of organisms, such as Darwin’s finches on the Galápagos Islands, tend to differentiate into new species to fill different niches.
D) The size of human populations, like animal populations, is directly determined by the carrying capacity of the environment.
E) People reproduce much more quickly than their resources do. This results in competition for food and space, and in suffering and death.

Thomas Malthus’s 1798 work, Essay on the Principle of Population, greatly influenced Darwin. Which of the following statements best summarizes Malthus’s idea?
A) Animals are able to pass to their offspring characteristics that were acquired in their lifetimes.
B) Individuals that can run faster are more likely to survive and pass their genes to the next generation.
C) Isolated populations of organisms, such as Darwin’s finches on the Galápagos Islands, tend to differentiate into new species to fill different niches.
D) The size of human populations, like animal populations, is directly determined by the carrying capacity of the environment.
E) People reproduce much more quickly than their resources do. This results in competition for food and space, and in suffering and death.

32. Wastes tend to accumulate in the environment as a population reaches the carrying capacity.
A) True
B) False
33.Regarding population dispersion patterns, which of the following is an inappropriate pairing?
A) randomly spaced — chance
B) evenly spaced — regular intervals
C) clumped — clusters
D) dispersive — randomly distributed
34.As a population reaches its carrying capacity, there is an increase in competition for
A) food.
B) shelter.
C) mates.
D) All of the above
35.Which of the following does not represent a population?
A) all the robins in Austin, Texas
B) all the grass frogs in the pond of Central Park, New York City
C) all the birds in Chicago, Illinois
D) all the earthworms in Yosemite National Park
36.An organism’s niche includes
A) what it eats.
B) where it eats.
C) when it eats.
D) All of the above
37.Because individuals in a population usually tend to produce more than one offspring,
A) populations tend to increase in size.
B) populations remain stable in size.
C) individuals tend to die quickly.
D) the number of individuals declines rapidly.
38.The movement of organisms into a given area from another area is called
A) immigration.
B) emigration.
C) population shift.
D) carrying capacity.
39.An organism’s niche includes its habitat.
A) True
B) False
40.When two species compete, the niche that each species ultimately occupies is its
A) competitive niche.
B) realized niche.
C) fundamental niche.
D) exclusive niche.
41.As resources in a population become less available, the population
A) declines rapidly.
B) increases slowly.
C) reaches carrying capacity.
D) enters a phase of exponential growth.
42.If a population grows larger than the carrying capacity of the environment, the
A) death rate may rise.
B) birthrate may rise.
C) death rate must fall.
D) birthrate must fall.
43.If the niches of two organisms overlap,
A) the organisms may have to compete directly.
B) the two organisms will always form a symbiotic relationship.
C) both organisms will disappear from the habitat.
D) one organism usually migrates to a new habitat.
44.In a logistic growth curve, exponential growth is the phase in which the population
A) reaches carrying capacity.
B) grows quickly.
C) growth begins to slow down.
D) growth stops.
45.What is happening in a population as it decreases?
A) The birthrate and the death rate remain the same.
B) The death rate becomes lower than the birthrate.
C) The death rate stays the same and the birthrate increases.
D) The death rate becomes higher than the birthrate.
46.An organism’s niche is the sum of all its interactions in its environment, including interactions with other organisms.
A) True
B) False
47.Which would be least likely to be affected by a density-dependent limiting factor?
A) a small, scattered population
B) a population with a high birthrate
C) a large, dense population
D) a population with a high immigration rate
48.The various growth phases through which most populations go are represented on a(an)
A) logistic growth curve.
B) exponential growth curve.
C) normal curve.
D) population curve.
50.Which of the following is a density-independent limiting factor?
A) earthquake
B) disease
C) emigration
D) parasitism

32. Wastes tend to accumulate in the environment as a population reaches the carrying capacity.
A) True
B) False
33.Regarding population dispersion patterns, which of the following is an inappropriate pairing?
A) randomly spaced — chance
B) evenly spaced — regular intervals
C) clumped — clusters
D) dispersive — randomly distributed
34.As a population reaches its carrying capacity, there is an increase in competition for
A) food.
B) shelter.
C) mates.
D) All of the above
35.Which of the following does not represent a population?
A) all the robins in Austin, Texas
B) all the grass frogs in the pond of Central Park, New York City
C) all the birds in Chicago, Illinois
D) all the earthworms in Yosemite National Park
36.An organism’s niche includes
A) what it eats.
B) where it eats.
C) when it eats.
D) All of the above
37.Because individuals in a population usually tend to produce more than one offspring,
A) populations tend to increase in size.
B) populations remain stable in size.
C) individuals tend to die quickly.
D) the number of individuals declines rapidly.
38.The movement of organisms into a given area from another area is called
A) immigration.
B) emigration.
C) population shift.
D) carrying capacity.
39.An organism’s niche includes its habitat.
A) True
B) False
40.When two species compete, the niche that each species ultimately occupies is its
A) competitive niche.
B) realized niche.
C) fundamental niche.
D) exclusive niche.
41.As resources in a population become less available, the population
A) declines rapidly.
B) increases slowly.
C) reaches carrying capacity.
D) enters a phase of exponential growth.
42.If a population grows larger than the carrying capacity of the environment, the
A) death rate may rise.
B) birthrate may rise.
C) death rate must fall.
D) birthrate must fall.
43.If the niches of two organisms overlap,
A) the organisms may have to compete directly.
B) the two organisms will always form a symbiotic relationship.
C) both organisms will disappear from the habitat.
D) one organism usually migrates to a new habitat.
44.In a logistic growth curve, exponential growth is the phase in which the population
A) reaches carrying capacity.
B) grows quickly.
C) growth begins to slow down.
D) growth stops.
45.What is happening in a population as it decreases?
A) The birthrate and the death rate remain the same.
B) The death rate becomes lower than the birthrate.
C) The death rate stays the same and the birthrate increases.
D) The death rate becomes higher than the birthrate.
46.An organism’s niche is the sum of all its interactions in its environment, including interactions with other organisms.
A) True
B) False
47.Which would be least likely to be affected by a density-dependent limiting factor?
A) a small, scattered population
B) a population with a high birthrate
C) a large, dense population
D) a population with a high immigration rate
48.The various growth phases through which most populations go are represented on a(an)
A) logistic growth curve.
B) exponential growth curve.
C) normal curve.
D) population curve.
50.Which of the following is a density-independent limiting factor?
A) earthquake
B) disease
C) emigration
D) parasitism