Concept:Carrying capacity is the maximum population size an environment can support sustainably.
Explanation:When a Tilapia population reaches carrying capacity, it does not stay at one fixed number forever.
Instead, it enters dynamic equilibrium, meaning it keeps fluctuating around that level.
If the population rises above carrying capacity, resources like food and oxygen become limited, so the population falls.
If it drops below carrying capacity, resources become plentiful again, so the population rises.
Thus, the population alternatively increases and decreases around the carrying capacity.
Answer:A. alternatively increases and decreases