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1665-Robert Hooke observes the first cell

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1665-Robert Hooke observes the first cell

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Robert Hooke discovered a structure in a cork slice using a primitive compound microscope. He only saw cell walls as this was dead tissue. He named them ¨cells¨ because they looked like the cells monks lived in.

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1670-1683 Anton Van Leeuweenhoek sees the first living cells

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1670-1683 Anton Van Leeuweenhoek sees the first living cells

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Anton van Leeuwenhoek, a Dutch biologist, looks at pond water with a microscope he made lenses for. He made several more discoveries on a microscopic level, publishing a letter to the Royal Society in which he included detailed drawings of what he saw. Among these was the first protozoa and bacteria discovered.

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1833 Robert Brown observes the center of cell

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1833 Robert Brown observes the center of cell

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Robert Brown, an English botanist, discovered the nucleus in plant cells.

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1838- Matthias Jakob Schleiden states that cells are the basic building blocks of all plants

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1838- Matthias Jakob Schleiden states that cells are the basic building blocks of all plants

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Matthias Jakob Schleiden, a German botanist, states that all plant tissues are composed of cells, and that cells are the basic building blocks of all plants. This statement was the first generalized statement about cells.

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1839- Theodor Schwann states that ALL living things are made of cells

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1839- Theodor Schwann states that ALL living things are made of cells

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Theodor Schwann, a German botanist reached the conclusion that not only plants, but animal tissue as well is made of cells. This ended debates that plants and animals were different in structure. He also pulled together and organized previous statement on cells into one theory, which states: 1 - Cells are organisms and all organisms consist of one or more cells 2 - The cell is the basic unit of structure for all organisms

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1855-Rudolf Virchow ads the the third part of cell theory

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1855-Rudolf Virchow ads the the third part of cell theory

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Rudolf Virchow, a German physician added the 3rd part to the cell theory. The original is Greek, and states Omnis cellula e cellula. This means that all cells develop only from existing cells. He was also the first to propose that diseased cells come from healthy cells.

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1. All living things are made up of cells.

2. Cells are the basic units of structure, function and physiology in living things.

3. Living cells can come only from other pre-existing cells.

4. Cells contain and pass on hereditary information during cell division.

5. All cells are relatively the same in relation to chemical composition and metabolic activity.