Question

question 27
zebra mussels
are an invasive exotic species that clog pipes and cover boat propellers
were introduced into the united states in the early 1900s
excrete waste that facilitates algae blooms and subsequent eutrophication of lakes
are presently restricted to the great lakes and hudson river, but they are expected to spread rapidly in the near future
are native to canada

Explanation:

Zebra mussels are invasive exotic species. They attach to hard - surfaces like pipes and boat propellers, causing problems. They were introduced to the US in the 1980s, not the early 1900s. Their waste doesn't directly cause eutrophication in the described way. They are not restricted to the Great Lakes and Hudson River and are not native to Canada.

Answer:

A. are an invasive exotic species that clog pipes and cover boat propellers