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Made the first crude compact microscope.
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Made The first simple microscope
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Used the term "cell" to describe the empty boxes found in cork.
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He discovered oxygen.
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Studied and determined that all animals are made of cells.
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Determined that all plants are made of cells
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Hypothesized that cells do't form on their own,cells divide to for new cells
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Discovery of the neutron
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Traces of liquid water discovered on Mars
