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Invented the first single lensed microscope, which lead to the theory of spontaneous cellular generation becuase without a microscope scientists could never have looked at cells so the theory wouldn't exist because cells never wouldv'e been discovered.
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Helmont did an experiment with a willow tree that showed him that cells form from other cells.
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Discovered and introduced them to the world which lead to the belief of spontaneous cellular generation because without the discovery of cells there would be no theory of their generation happening spontaneously.
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Leeuwenhoek improved the magnification of microscopes, which hleped lead to the theory, and its disproving, of spontaneous cellular generation because without the new magnification you couldn't see as many cells, thus meaning you couldn't run as many tests to aquire, or disprove, the theory.
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Started the argument that everything living is made of cells.
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Discovered the nucleus in plant cells.
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Discovered that plants were made of cells, which lead to the theroy of spontaneous cellular generation because this discovery intrigued other biologists so they would discover how they formed.
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Schwann discovered that animals contained cells, which contributed to the theory of spontaneous cellular generation because this intrigued scientists by showing that every living thing is made of cells.
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Discovered that sperm and eggs were cells too, which helped disprove the theory of spontaneous cellular generation because this showed how life was made.
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Finally, the cell theory is proven by observing cell division.
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Disproved the theory of spontaneous cellular generation, after 2 millennia.
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Invented the theory of spontaneous cellular generation, although it was later disproven.
