Zooplankton populations in Lake Erie and the Hudson River have declined by up to 70% since the arrival of zebra mussels because ________

A) waste from zebra mussels promotes bacterial growth that kills zooplankton
B) zebra mussels carry a parasite that kills zooplankton
C) zebra mussels feed on phytoplankton, which zooplankton need as a food source
D) zebra mussels prey exclusively on zooplankton
E) zebra mussels block sunlight penetration into lakes and thus prevent zooplankton from photosynthesizing


C

Environmental & Atmospheric Sciences

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