__________ are free-living organisms that grow and multiply on their own.

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Planktonic cells are free-living organisms that grow and multiply on their own, and are found in aquatic environments such as oceans, lakes, and rivers. Endospores are dormant, resistant structures formed by certain bacteria in response to adverse environmental conditions. Parasites and symbionts are organisms that live in close association with another organism, and may or may not be free-living. Heterocyst cells are specialized cells found in certain cyanobacteria that are involved in nitrogen fixation.

__________ Are Free-Living Organisms That Grow and Multiply on Their