Multiple choice

Sea otters, an example of a keystone species, limit the density of which of the following species?

  1. Sea urchins

  2. Steller's sea cow

  3. Kelp

  4. Corals

  5. Physalia

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sea otters (Enhydra lutris) are commonly cited as an example of a keystone species because they limit the density of sea urchins.