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Zacharias and Hans Jansson were dutch, optical scientists, who mainly studied and made spectacles. Zacharias invented the first compound microscope

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Robert Hooke discovered cells by looking at a cork using a microscope. To him structures of the cork looked like tiny cells in a monastery.

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Francesco Redi conducted one of the first examples of biological experiments. The ending results created the thought that cells are only made or come from other cells.

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Anton Van Leeuwenhoek made himself a microscope. He saw bacteria in dental scrapings. He thought that it looked like tiny animals, so he started calling them animalcules.

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Robert Brown studied plants. He examined plant cells. He suggested that the nucleus plays a role in development and fertilization.

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Matthias Schleiden observed many different types of plants using a microscope. He examined that all parts of all the plants were made of cells.

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Theodor Schwann studied how organisms function. He looked at animal tissue under a microscope. He found out that all animals are made up of cells.

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He confirmed that the existence and functioning of the cell membrane.

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He used his understanding of the cell theory to explain the effects and disease on organs. He also believed that cells come from pre-excisting cells.

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He refuted the idea that all living organisms arise from non-living matter. The results from his experiment proved that all cells come from pre-excisting cells.