Phytoplankton are the autotrophic component of the plankton community. The name comes from the Greek words φυτον ("phyton"), or "plant", and πλαγκτος ("planktos"), 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 (alt… (More on Phytoplankton)