which statement explains how a stable ecosystem can exist while the populations in it vary over time?
a) if a prey population grows, it will decrease the size of the predator population because predators will have less competition for food.
b) if a disease spreads through a population that has a lot of genetic variation, resistant individuals will survive and the population will recover.
c) less rain one year will cause populations to decrease due to a lack of food, and populations will stay at this reduced size even when rain returns.