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Invented the first compound and optical microscope. Anton Van Leewenhoek would later go on to improve his invention.
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He obsevered pieces of cork fro a cork tree under a microscope, which led him to use the word "cell".
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He improved Zacharias Jansen's microscope. He also was the first to observe and describe single celled organisms, which he referred to as animalcules, and we now call tthem microorganisms.
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He was a German botanist, and a co-founder of the cell theory with Theodor Schwann and Rudolf Virchow.
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He was a German zoologist. He made the discovery of the organic nature of yeast, and the invention of the term metabolism.
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He was a German pathologist and he was referred to as the "Father of Pathology". He also came up with the now popular medical idea, "Omnis cellula e cellula", or "Every cell originates from another cell".