Species a and b are found in the same ecosystem. what could be inferred from the data shown in the graph?

a. species a is a keystone species.

b. species b is a predator of species a

c. species b is the prey of species a

d. species a is a parasite of species b

B is the correct answer. It can be inferred from the graph that Species B is the predator of Species A, because when the numbers of Species B drop, the numbers of Species A rise, and vice verse. This suggests that when there are fewer predators, the number of prey goes up.