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aristole classified animals by blooded and non blooded, live bearing birth and egg bearing birth, hard bodies and soft bodies and shell and no shell
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jansen invented the first basic microscope. Without this invention, people would have never seen cells
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Van Helmont was the first to recognize that many reactions produce substances that are, in his words, “far more subtle or fine…than a vapour, mist, or distilled oiliness, although…many times thicker than air.”
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robert hooke looked at cork and found the first cells
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Anton van Leeuwenhoek reported to the royal scoiety that he had discovered "litttle animals' --bacteria and protozoa-- in various examples
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Matthias Jakob Schleiden (1804-1881) Schleiden was the first to recognize that all plants, and all the different parts of plants, are composed of cells
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lorenz Oken proposes that “all organic beings originate from and consist of vesicles or cells vesicles, when singly detached and regarded in their original process of production, are the infusorial mass or protoplasma whence all larger organisms fashion themselves or are evolved.”
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Louis Pasteur (1822-1895) set out to disprove spontaneous generation with a now-classic experiment that both firmly established the cell theory beyond doubt and solidified the basic steps of the modern scientific method.
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Robert Browns Cell Theory contributed to the determination of how the cell nucleus looked like and how the cytoplasm function. Brown was a pioneering scientist who used the microscope. As a botanist, he made various significant contributions in the realm of plant pollination and fertilization; and the difference between gymnosperms species and angiosperms species.
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theodore schwann published "Microscopic Investigations on the Accordance in the Structure and Growth of Plants and Animals," which included the first statement of the cell theory: All living things are made up of cells.
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albrecht provided much evidence to show that cells cannot arise freely, but only from existing cells. He was the first to isolate the cells of smooth muscle (1848), as expounded in Handbuch der Gewebelehre des Menschen
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rudolf virchow extended the work of schwann and schlieden by proposing that all living cells must rise from pre-existing cells
