Which one of the following animals is most likely to be a keystone species, based on the food web provided?

Question

Mouse
deer
grasshopper
frog

Answer 1

Frog

In a food web, a keystone species is one that has a disproportionately large effect on its environment relative to its abundance. In the provided food web, frogs are predators that feed on both grasshoppers and mosquitoes. By controlling the populations of these insects, frogs play a crucial role in maintaining the balance of the ecosystem. Therefore, the frog is most likely to be a keystone species in this particular food web.