A populations carrying capacity

a. may change as environmental conditions change

b. can be accurately calculated using the logistic growth model

c. increases as the per capita growth rate (r) decreases

d. can never be exceeded

The correct answer is a. may change as environmental conditions change.

Explanation:

The maximum number of individuals of a species population an ecosystem can sustain for a long time is called its carrying capacity. There are four major factors that influence the carrying capacity of an ecosystem. These are food, water, environmental condition, and space.

Change in environmental condition can affect the carrying capacity for example if the ecosystem is close to human population then pollution can affect the carrying capacity of the ecosystem adversely because many organisms can not survive well in polluted ecosystem. Therefore carrying capacity can decrease for some species population. So the right answer is a.