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Pasteur placed broth in a special type of flask that allowed air to enter and exit. Then, he heated the broth and flask, so they no longer contained any bacterial cells. Finally, after observing the flask for a few days and noticing that nothing grew in the flask, he was able to conclude that

Respuesta :

cells come from pre-existing cells 

hope it helps
all cells must come from  pre-existing cells.

this is for study island btw 
Hope this helps!!!

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