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It depends on the kind of plankton. Some plankton move using fine hair-like projections around their cells called cilia (singular: cilium). Some move using the help of whip-like projections called a flagella (singular: flagellum). Other members of the plankton community move using leg-like appendages, such as larval arthropods. Some members of the phytoplankton community can move up and down in the water column by controlling the amount of gas in their cells, though it's not a purposeful movement like in an animal. It's probably more of an adaptation to allow these phytoplankton to move up and down to take advantage of sunlight when it is available. Incidentally, most plankton are not capable of purposeful swimming. That is, though they can move, their movements are incapable of overcoming the movements of waves and currents. That's why they are called plankton. "Plankton" comes froma Greek root that means "wanderer" (the same root word that gives us the word "planet").

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16y ago

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