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Cell Theory
Before the Microscope
What did people think caused disease
before the microscope was invented?
Evil Spirits/God
People who became sick were
being punished
Bad Blood
Needed to remove blood to heal person
Was not successful, people died
The Cell
The smallest unit that can perform all life
processes
What’s the Big Deal?
Inner Workings of a Cell
The Cell Theory
• Has 3 tenets (ideas) that make up this theory
1.) All living things are composed of cells
The Cell Theory
2.) Cells are the most basic unit of any living
thing
The Cell Theory
3.) All
cells come from preexisting (already
alive) cells