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Transcript 
Early Scientists
Anton van Leeuwenhoek
Discovers
single-celled,
animal-like organisms, now
called protozoans. (1683)
First compound light
microscope
Robert Hooke
Coined
the term “cell” (1665)
Matthias Schlieden
All
plants are made of
cells (1838)
Theodor Schwann
All
animals are made of
cells (1839)
Rudolf Virchow
Cells
can only arise
from pre-existing cells
(1855)
Cell Theory
1.
2.
3.
All organisms are made of
cells.
All cells arise from preexisting cells.
The cell is the most basic
unit of life.
Spontaneous Generation?
Francesco
Redi
–Italian doctor who proved
maggots came from flies
(1668)
Germ Theory of Disease
Microscopic
organisms
cause diseases.
Frenchman Louis Pasteur
Why do we care
today?
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