Question

when the resources in an environment are at optimum levels, what can happen? the population size can grow the population size can decrease

Explanation:

When resources are at optimum levels, there is enough food, space, etc. for organisms. This allows more individuals to survive, reproduce, and thus the population size can grow. Limited resources usually lead to population decrease (e.g., due to competition, lack of food causing starvation). Optimum resources remove these limiting factors for growth.

Answer:

The population size can grow