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Cells are the basic unit of structure and function of the human, animal, and any other living thing. Cells are a small unit just like a living matter. There are different kinds of cells but the two kinds that are familiar are animal and plantcells. Plant cells have a cell wall and chloroplasts. Human cells have a cellular membrane. Cells all have different sizes, shapes, and jobs to do.

Human and animal blood cells travel through the blood stream carrying oxygen and everything else that your body, and brain, needs.
The official definition of the word cell is "the smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane."

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