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They invented the first compound microscope in the late 16th century

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Saw tiny boxlike cavities in a thin cork slice which he illustrated and described as cells. He also discovered plant cells.

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He saw cells soon after Hooke did. Leeuwenhoek used a microscope with an improved lens that could magnify objects almost 300x. He named these animolecules which included protozoa and other unicellular organisms.

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Proposed the first foundational belief about cells which was, that all plant tissues are composed of cells

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He came to a conclusion that all animal tissues were made up of cells.

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Virchow’s work made it more clear that disease is occur at the cellular level his work lead to scientist being able to diagnose disease is more accurately than before.