Which one of the following animals would most likely be defined as a keystone species?
A) housefly
B) nauplii a species of zooplankton)
C) fathead minnow
D) sea otter

Question

Quizplus · Accepted Answer

A keystone species is one whose impact on an ecosystem is disproportionately large relative to its biomass or abundance. Sea otters are considered a keystone species because they control the population of sea urchins, which in turn graze on kelp. Therefore, without sea otters, the population of sea urchins would explode, leading to overgrazing of kelp forests and subsequent loss of habitat for a variety of other species.

Which One of the Following Animals Would Most Likely Be