Most marine photosynthesizers are unicellular so that the small organisms can eat them.
Most marine photosynthesizers are unicellular in order to provide food to the unicellular organisms such as zooplankton. Marine photosynthesizers are microscopic, unicellular plants, bacteria, algae and other photosynthetic organisms that used sunlight and produces food for the for small creatures called zooplankton so that's why most marine photosynthesizers are unicellular.
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