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Coral reefs and estuaries are the most diverse ecosystems in the ocean. Which of the following characteristics explains why these ecosystems can support such high levels of biological diversity?

A

Both ecosystems receive little sunlight and therefore have low rates of photosynthesis.

B

Human impact on estuaries and coral reefs is low they have few species that are economically important to humans.

C

Neither coral reefs nor estuaries provide many niches for biological diversity to evolve.

D

Both ecosystems have high primary productivity.

E

Both ecosystems support only small populations of phytoplankton because they receive very little nutrients.

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