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

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


Answer: A

Environmental & Atmospheric Sciences

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