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He invented the field of formal logic. He also found that each germ came from another. https://www.britannica.com/biography/Aristotle
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He invented the first compound microscope. He invented the microscope by combining two convex lenses within a tube. His device helped many scientists with the spontaneous generation. http://www.historyoftelescope.com/telescope-invention/zacharias-janssen/
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He discovered the process of photosynthesis. http://www.historyoftelescope.com/telescope-invention/zacharias-janssen/
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He discovered plant cell. More specifically he discovered cell walls in cork tissue. https://ucmp.berkeley.edu/history/hooke
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The first microscope that had lenses that could magnify. http://www.bbc.co.uk/history/historic
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Discovered the cell theory, he also invented pepsin in 1836
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A proponent of Natural Science and philosophy he founded the fundamental units of life. https://www.britannica.com/biography/Lorenz-Oken
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He discovered the nucleus of a cell.
https://biography.yourdictionary.com/robert-brown -
He was the cofounder of Cell Theory the cell as a basic unit of plant structure. https://www.britannica.com/biography/Matthias-Jakob-Schleiden
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He discovered the help of powerful microscopes that the sperm and egg were composed of cells and that humans are formed of cells. https://www.sutori.com/item/untitled-d27b-e6b4
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He discovered the origin of cells was the division of pre-existing cells. https://en.wikipedia.org/wiki/Rudolf_Virchow
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He developed the process of pasteurization. He also proved germs caused diseases and developed vaccines for anthrax and rabies. https://www.livescience.com/43007-louis-pasteur
