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His theory about how organisms go through three stages to form was used and that later was called epigenesis.
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Louis pasteur set his eyes on disprooving the theory of spontaneous generation by setting up an experiment and that experiment was with a straight neck flask and a s neck flask and after weeks only the straight neck flask was discolered and he said the s neck flask would be the same if spontaneous generation is true.
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in the early 1600s after Zacharia Janson made the microscope
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Anton van Leeuwenhoek decided to make his own microscope and looked at as much stuff as he can and discovered bacteria.
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Anton van Leeuwenhoek sent a letter to a collegue in england Robert Hooke and he came up with the name cell while looking at cork.
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Matthias Schleiden who studied plants underneath a microscope discovered that they all were made out of cells.
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Theodor Schwann studied animal cells and after researching them for some time he concluded that all animals are cells.
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Schwann and schlieden argued over wether or not cells came from other cells and then Rudolf Virchow stepped in and told schlieden that cells were made from other cells.
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Jan Baptist van Helmont started to discover photosynthesis by saying that plants can't only grow on the minerals in the soil.
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Robert Brown analyzed a nuecleus in plant cells and neclei in animal cells and found out that there was a liquid in the cells call protoplasm and discovered that cells are made up of living material.
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Albrecht von Roelliker discovered that sperm and eggs are also cells
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Lorenz Oken discovered smething he called infusoria Even though he was incorrect he anticipated the development of the cell