What is the name for the group of photosynthetic, microscopic organisms that lives in the ocean? coccolithophores floaters plankton phytoplankton?

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What is the name for the group of photosynthetic, microscopic organisms that lives in the ocean? 

Phytoplankton is the name for the group of photosynthetic, microscopic organisms that lives in the ocean. Similarly plants that grow on land, phytoplakton contains chlorophyll that captures sunlight to make food. Phytoplakton in Greek means "plant".

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