What three things happen to plates at the plate boundaries (where two or more plates come together)?
a. at spreading ridges.
b. at convergent margins.
c. at transform faults.

there is none because earth is stationary and flat.

the population of unionid mussels in the hudson river decreased after zebra mussels were introduced. zebra mussels, a nonnative species, competed with the unionid mussels for food. the zebra mussels were able to outcompete the unionid mussels, allowing the zebra mussel population to increase dramatically over six years. the unionid mussel population decreased due to a lack of food.

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