1-1 Preséntate en japonés おはよう!キラです

Do we (by “we” I mean science) actually know what causes the changes ?
Because, as the bacteria example shows very well, natural selection favours antibiotic-resistant bacteria over non-resistant ones, but how did this resistant one appear in the first place ? It can’t have “always” been there but in a small amount, waiting for someone else to die out and let it develop, just like homo sapiens didn’t exist at all when the dinosaurs did, they actually appeared after some ape underwent changes.


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