In an Aquatic Ecosystem,a Secondary Carnivore Is Temporarily Excluded and Then,after

Multiple Choice

In an aquatic ecosystem,a secondary carnivore is temporarily excluded and then,after a period of time,is returned.Which one of the following is NOT an expected top-down effect after it is returned?

A) Primary carnivores become less abundant.
B) Primary productivity increases.
C) Algae decrease.
D) Herbivores become more abundant.