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He discovered that all cells come from other cells, as well as cells in bone, and was one of the first to look at leukemia.

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discovered that all animals are made of cells. and founded modern histology by defining the cell as the basic unit of animal structure.

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discovered that all plants are made of cells. he studied elements of cells as the smallest unit of organization.

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He was one of the first people to think looking microscopically. he discovered both protoists and bacteria

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Hooke observed boxlike formations and described and observed them as cells. hookes discovery served as the foundation of the cell theory.

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He had invented the first compund microscope, he discovered that if you put a lense of both sides of an object, it became magnified.