Very small living things that cannot be seen with the naked eye, like bacteria, tiny algae, and protozoa., microorganisms, An organism made of only one cell that performs all life functions., Single-celled, A group of similar cells living together, colony, Living organisms that live in water and make their own food through photosynthesis; can be single-celled or multicellular., algae, Living organisms that live in water and make their own food through photosynthesis; can be single-celled or multicellular., protozoa.

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