Question

which of the following is an example of a keystone species? sea otter kelp sea urchin

Explanation:

A keystone species is one that has a disproportionately large effect on its environment relative to its abundance. Sea otters are considered a keystone species because they control the population of sea urchins. If sea otters are removed, sea urchin populations explode and overgraze kelp forests, disrupting the entire ecosystem. Kelp is a foundation species (provides the structure for the ecosystem), and sea urchins are a regular part of the food web but not a keystone in the sense of having the wide - ranging ecosystem - stabilizing role like sea otters.

Answer:

Sea Otter