Zebra Mussels Were Brought to North America from Europe and Have

Zebra mussels were brought to North America from Europe and have spread rapidly through the Great Lakes and Mississippi River.Attaching themselves to boats, piers, and other hard surfaces, the adults feed on plankton, which clarifies the water but drastically decreases the food available for native mussels and fish.The clearer water promotes toxic algal blooms.Zebra mussels can breed in a wide range of temperatures.A zebra mussel lives five years and produces five million eggs, of which 100,000 reach adulthood.The offspring of a single mussel will produce half a billion adult offspring. All of the following contribute to the fact that zebra mussels have become major pests except

A) they reproduce rapidly.
B) they have few or no predators.
C) they adapt readily to new habitats.
D) they can breed in a wide range of temperatures.
E) they attach to hard surfaces.