Like, if you have a leftover piece of meat and just leave it in your house, sooner or later maggots/flies are going to be coming out of it even if there were no (visible) flies in the house previously.
They come from flies that you just didn’t see, there was a famous experiment by Francesco Redi that proved that rotten meat in a sealed container did not generate maggots bc there was no way for a fly to enter
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