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All cells are derived from pre-existing cells.

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The cell is the fundamental unit of function and structure for all living things.

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All living things/organisms are made up of 1+ cell.

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Rudolf Virchow was a doctor who argued the idea that all cells are derived from other, pre-existing cells.

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Theodore Schwann was a zoologist that came up with the idea that all animals are made up of cells.

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Matthias Schlieden was a botanist who came up with the idea that all plants are made up of cells.

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Anton VanLeeuwenhoek made his own microscope and used it to look at the gunk in his teeth. He thought what he saw through the microscope looked like tiny animals, so he called the cells "animalcules".

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Robert Hooke came up with the word "cell" after looking at cork through a microscope and comparing it to the rooms/cells monks live in.

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Zacharrias Janssen is credited with creating the 1st compound microscope.