Question

what is equilibrium? a state where a population is evolving a state where species are dying out a state where things arent changing

Explanation:

In biology, equilibrium refers to a state where there is no net change. When a population is in equilibrium, there is no significant evolution (so the first option is wrong). It doesn't mean species are dying out (second option is wrong). It implies a stable state where things aren't changing in a significant way.

Answer:

a state where things aren't changing