Zebra mussels are native to poland and the soviet union. they were probably transported to the united states via trans-oceanic vessels. with no natural predators in the united states, zebra mussels

a)
will eventually die out due to lack of food supplies.

b)
caused a huge decline in native clam and mussel populations.

c)
compete unsuccessfully with native mussels and quickly die.

d)
successfully share the niche with native mussels and clams.

Correct B). Caused a huge decline in native clam and mussel populations.  

The Zebra mussels are the water animals that are D- shell, which is made up of hinged valves that are joined together by a ligament. The main problem with them is that they filter water in order to eat the plankton. As they eat the plankton, it creates a competition between them and fish for food.

They are known to kill mussels population by attaching to their shells, they also out compete for food native mussels.

Hence, the correct answer would be option B.

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.