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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?


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


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


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


Both ecosystems have high primary productivity.


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

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