Answered and updated on Aug 4, 2020, by Krister Sundelin, Quora contributor, self-proclaimed atheist, as follows:
“Either they appeared as grown-ups by magic, or they were nursed by their one-mutation-away-from-Homo-sapiens parents.”
Krister went on to compare evolution to the color spectrum, which was very imaginative.
I added my little comment.
In the history category is my reliance on Wikipedia’s valiant attempt to explain the theory of evolution, which is titled, “Last Common Ancestor.”