cell, tissue, organ, organ system, organism

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Cell

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the smallest unit that makes up all living organisms and the tissues of the body

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Tissue

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a group of cells that have similar structure and that function together as a unit

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Organ

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a structure composed of a group of tissues that work together to perform a specific function

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Organ System

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a group of organs that work together to perform a certain function

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Organism

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a living thing that has an organized structure