What Zooplankton is considered a keystone species?

a. Ctenophores
b. Meroplankton
c. Pteropods
d. Krill


ANS: D
Krill are considered the keystone of the Antarctic ecosystem. They are the food source for a
tremendous number of animals, including large whales. Information can be found in the section
Zooplankton Consume Primary Producers.

Environmental & Atmospheric Sciences

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