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Coral reefs are a specialized aquatic biome in which a large amount of primary production from photosynthesis occurs. The reef itself grows slowly up from the sea floor as each successive generation of coral anchors itself to the remaining hard exoskeletons left by the previous generations.

Thus, coral reefs are found exclusively in the
Select Option pelagicbenthic
realms of the
Select Option photicaphotic
zones in the world’s oceans.
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