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Janssen made the fist microscope but he didn't know what to do so he sell it.
On 1590 that ocurre

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In  1668 he make his own microscope to see the cells
And then he descover the vateria and called animacules they discoverd these in the people teeth

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And thanks to Hook we named now the cells "cells" in 1665

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The were agree in the tow statems but they dessagree in the third statement that it was "cells come from preexisting cells" in 1838

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He created an experiment that proved the 3rd statement