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Aristitle was the first person ever to have come up with a classification system for animals. He separted them into animals with and without blood and live-bearing and egg-bearing and so on.
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Zacharias Jenssen invented the first compund microscope with two lenes instead of one
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Anton Van Leeuwenhoek was the first person to improve the microscope by grinding and polishing lenses to make them magnify 270x.
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Jan Baptist van Helmont said that digestion was aided by a chemical eagent, or "ferment" within the body, amost the same as the modern day emzyne
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Robert Hooke was looking at cork and fleas when he discovered that the cork had tiny box like sections and he named them cells.
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Robert Brown discovered while examining pollen, minute particals executing a continous motion, later called Brownian Motion
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Schwann concluded that all living things are composed of cells and cell products, this became known as cell theory.
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Matthias Schleiden is know as the co-founder of cell theory because he realized the importance of the cell nucleasus. Scheiden also concluded that all plant parts are made of cells.
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Oken speculated that plants and animals are made up of tiny living "infusoria"
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Rudolf was the first peron to recognize leukemia. He also discovered cells in bones and in connective tissue. He also beleived that cells came from pre-exsisting cells.
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Louis Pasteur said that there can not be spontainious generation because all life has to come from life.
