Question

of which the urchins and otters are a part. For this reason, sea otters are considered _____. a parasite a keystone species a predator an indicator speciesWithout the presence of sea otters, sea urchins would otherwise overgraze kelp beds, dramatically changing the marine community of which the urchins and otters are a part. For this reason, sea otters are considered _____.

Answer 1

A keystone species would be the correct answer

Answer 2

I think it is keystone.  If they were not there the population of urchins would go up and the kelp would go down.