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Early Scientists.

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Presentation on theme: "Early Scientists."— Presentation transcript:

1 Early Scientists

2 Anton van Leeuwenhoek Discovers single-celled, animal-like organisms, now called protozoans. (1683) First compound light microscope

3 Robert Hooke Coined the term “cell” (1665)

4 Matthias Schlieden All plants are made of cells (1838)

5 Theodor Schwann All animals are made of cells (1839)

6 Rudolf Virchow Cells can only arise from pre-existing cells (1855)

7 Cell Theory All organisms are made of cells.
All cells arise from pre-existing cells. The cell is the most basic unit of life.

8 Spontaneous Generation?
Francesco Redi Italian doctor who proved maggots came from flies (1668)

9

10 Germ Theory of Disease Microscopic organisms cause diseases.
Frenchman Louis Pasteur

11

12 Why do we care today?

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