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Aristotle was drawn to animal classification and discovered aspects of connection between the soul and the human body.
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Zacharias Jansen made the first compound microscope by combining two convex lenses together.
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Hooke introduced the word "cell" to science and found cells in a cork.
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Leeuwenhoek discovered protozoa. He stated that he saw "little animals" in the microscope.
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Leeuwenhoek improved magnification in microscopes by cleaning and polishing the lenses.
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Leeuwenhoek discovered animalcules, a microscopic or minute organism, like an amoeba or paramecium, usually considered to be an animal.
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LEeuwenhoek discovered bacteria from a sample of saliva from his own mouth.
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Lorenz Oken came up with a new and improved animal classification.
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Louis Pasteur set out to disprove spontaneous generation with a now classic experiment that both firmly established the cell theory beyond doubt and solidified the basics steps of the modern scientific method.
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Schleiden discovered that plants were made up of cells. He was the first to realize this.
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Schwann discovered that animals were composed of cells.
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Roelliker realized that sperm cells and egg cells both are also classified as cells.
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Virchow, Schleiden and Schwann all made up the cell theory. Schleiden discovered plant cells, Schwann discovered animal cells and Virchow found that all cells come from other existing cells.
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Killiker discovered and described the mitochondria, part of a cell.
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Flemming described chromosome behavior during mitosis.
