Question

what happened in the lab after generation 4?
the predators decreased and the prey decreased in the population.
the prey increased in number causing predator population to increase.
the predators increased in number causing a decrease in prey.
the predators decreased in number causing a population increase in prey.

Explanation:

After generation 4, the number of mussels (prey) increased sharply from around 10 to 35 - 40. An increase in prey population typically provides more food for predators, which would cause the predator population to increase.

Answer:

The prey increased in number causing predator population to increase.