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Click Link Below Aristotle believed there was no real boundary between living and nonliving things.
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Click Link BelowZacharias Jansen invents the fisrt microscope to see cells up closer.
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Click Link Below Jan Baptista van Helmont believes mixing a dirty shirt with several grains of wheat would produce adult mice in 21 days.
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Click Link Below In 1665, Robert Hooke gave cells their name and was the first person to view cells up close under a microscope.
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Click Link Below In 1801 a botanist, Robert Brown, whose work on the plants of Australia and New Zealand became a classic; especially important were his descriptions of how certain plants adapt to different environmental conditions. Brown is also credited with discovering the cell nucleus and analyzing sexual processes in higher plants.
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Lorenz Oken proposes that all organic beings originate from and consist of vesicles or cells. -
Click Link Below It was not until 1838 that Matthias J. Schleiden, a German botanist interested in plant anatomy, stated, “the lower plants all consist of one cell, while the higher ones are composed of (many) individual cells.”
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Click Link BelowTheodor Schwann states that all living things are made up of one or more cells.
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Click Link Below Albrecht von Roelliker realized that sperm cells and egg cells are also cells.
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Click Link Below Rudolf Virchow’s greatest accomplishment was his observation that a whole organism does not get sick—only certain cells or groups of cells.
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Click Link Below Louis Pasteur established the cell theory beyond doubt and solidified the basic steps of the modern scientific method in 1863. He also proved spontaneus generation wrong.
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Clink Link Below Anton Van Leeuwenhoek discovers "little animals", or as we know them bacteria and protozoans. He also improved the miscroscope.
