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The father-son duo created the compound microscope using two lens' in a tube.

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Discovered cell walls in cork tissue using a microscope. Coined the term "cell".

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Antoni was the first to see single-celled organisms in pond water.

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First to prove that cells were independent of eachother and had their own cell walls.

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Discovered the nucleus of the cell from plant tissue. Contributed to the cell theory.

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Concluded all plant tissues are composed of cells and embryonic plant came from a single cell. Said that the cell is the basic building block of all plant matter.

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Proposed the cell theory, said all plant and animal tissues are composed of identical cells.

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Observed how a sperm cell penetrated an egg cell.

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Kölliker described mitochondria. Rudolf said that cells arise only from other cells and cannot be generated from non-cellular material.

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Said that cells come from pre-existing cells. Used this theory for cellular pathology.