There are no hard lines that divide species over time. It’s all just gradual change over thousands of generations. A million years ago they were all *homo erectus* and over time since then, they gradually started looking more and more human-like, until today. There’s no point where you could look at a pair of mates and say “the parents aren’t *homo sapiens*, but their baby is”. That never happens. Speciation is slow and gradual. Babies are always at most just slightly different than their parents. A small mutation here, a small mutation there, and it snowballs over thousands of generations until there’s been so many mutations that the great-x10000-grandchildren look hardly anything like their ancestors.
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