Question

This text explains a cause-and-effect pattern in the Hudson River ecosystem that began with the zebra mussel invasion. What effect did the zebra mussels have on the phytoplankton in the Hudson River?

A. The number of phytoplankton in the river rose by a little.
B. The number of phytoplankton in the river fell by a little.
C. The number of phytoplankton in the river rose by a lot.
D. The number of phytoplankton in the river fell by a lot.

Answer 1

Answer:

D

Explanation:

Answer 2

Answer:

D The number of phytoplankton in the river fell by a lot.

Explanation:

Phytoplankton are an important part of the aquatic food web because they are the primary producers of food for zooplankton and foraging fish. ... When zebra mussels are introduced into a waterbody such as Seneca Lake they can impact this food web by competing for food with other organisms that depend on the phytoplankton.