The author refers to “filter-feeding animals” (line 20) in order to______
A.
provide an example of a characteristic sign of reef deterioration
B.
explain how reef communities acquire sustenance for survival
C.
identify a factor that helps herbivore populations thrive
D.
indicate a cause of decreasing nutrient input in waters that reefs inhabit
E.
identify members of coral reef communities that rely on coral reefs for nutrients