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In approximitely 330 BCE, Aristotle discovered that even the most random things, like chick embryos, go through many different processes and stages by the work of cells before reaching their final stage.
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Around 1590, he founded the idea of a microscope by simply noticing that by placing two lenses together, what you look at will magnify.
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In the early 1600's, Jan Baptist Van Helmont contributed to the cell theory by his discovery of photosynthesis. He discovered it by conducting a 5-year long experiment with a willow tree, studying how it reacts to different soils and waters, and in the end, discovering its reaction and process.
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In 1665, This man discovered plant cells in general. His discovery led to a clearer understanding of cells.
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In 1674, while studying a single drop of pond water under a microscope, found lots of single-celled organisms, which he called "animalcules" (plant an animal), swimming around in the droplet. This made a contribution to the Cell Theory by making yet another discovery of cells in a new location.
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In 1805, Lorenz Oken stated that "All living organisms originate from and consist of cells." This was supposedly the first statement specifically towards the cell theory.
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In 1831, Brown discovered the nucleus and its role, ultimately contributing in a cell's structural way for the first time.
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In 1838, Scheilden found that all plants tissues are coomposed of cells. He also discovered that an embryanic plant aros from a single cell.
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In 1838, Theodor Schwann, with the assistance of Matthias Scheilden, developed the "Cell Theory" itself. They found that all plant and animal tissues are composed of cells. They also discovered that all cells inside a certain organism are identical.
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In 1855, this man released a statement saying that all cells come from pre-existing cells.
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Around 1861, he stated that tissue was all made up of cells and that cells were all made up of pre-existing cells
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This man created/discovered pastuerization by finding that you can remove bacteria from a liquid by boiling it then cooling it again.
