Question

a population crash is likely to occur when
○ a population approaches its carrying capacity
○ a population greatly overshoots carrying capacity
○ resources are essentially unlimited
○ environmental resistance comes into play gradually

Explanation:

A population crash occurs when a population greatly overshoots its carrying capacity. When this happens, resources become scarce and environmental conditions deteriorate, leading to a rapid decline in the population size. Unlimited resources would not lead to a crash, and a gradual onset of environmental resistance is not the main condition for an immediate population crash. Approaching the carrying capacity is not the same as overshooting it by a large margin which triggers a crash.

Answer:

a population greatly overshoots carrying capacity