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Hooke designs a microscope and discovers structures in cork that he terms "cells".
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After experimentation, Redi theorizes that flies do not arise spontaneously from rotting meat, but come from other flies.
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"All plants are made of cells."
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"All animals are made up of cells."
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"All cells come from cells."
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Microorganisms do not arise spontaneously in a flask of sterilized broth, unless it is exposed to air.
