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Organisms are made up of different kinds of cells and tissues. The more complex the organism, the more complex the makeup. For example, a single-celled organism has just one cell that comprises it, and a human has cells, tissues, organs, and body systems that enable the body to function. Despite the vast differences from a single-celled paramecium and a human, both are organisms, and both are made up of cells and tissues.

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10y ago

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