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Phytoplankton are the autotrophic, mixotrophic and heterotrophic component of the plankton community. The name comes from the Greek words φυτόν, meaning "plant", and πλαγκτός, meaning "wanderer" or "drifter". Most phytoplankton are too small to be individually seen with the unaided eye. However, when present in high enough numbers, they may appear as a green discoloration of the water due to the presence of chlorophyll within their cells. (via Freebase)