Which marine habitats would have the least access to primary producers?

Most marine primary producers, such as algae and phytoplankton, need sunlight for photosynthesis. The deep sea and much of the sea floor receive little or no sunlight, so they have the least access to these producers. Salt marshes, estuaries, reefs, lagoons, mangroves, and intertidal zones are generally closer to sunlight and support more photosynthetic life.

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