Part 1: Yeast are living ~~animals~~ fungi. They are killed by baking the bread. There is zero living yeast left by the time it’s bread. Dead yeast don’t do any fermentation, they’re dead.
Part 2: The mold that grows on bread grows from spores that land on the bread after it is baked. The spores came from the countertop, the air, and the hands of anyone touching the bread.
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