How are changes in populations related to the availability of an ecosystem's resources?
A.
Changes in population are independent of the availability of an ecosystem's resources.
B.
Population sizes are limited by the amount of resources that are available.
C.
As populations grow, ecosystems produce more resources in order to support the larger population.
D.
Large populations need the same amount of resources as small populations.
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B

Explanation:

The answer is B; there cannot be a large population in an ecosystem that only provides a small amount of food; similar to how a family of six cannot live off of the same amount of food that a single person could easily live off of. This concept rules out both A and D, and C is also incorrect because the ecosystem is independent of the population, it is not aware of the amount of organisms living it; so it cannot alter it's resources based off of what organisms live in it.

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