Great question. And it not only applies to the species we call mankind. But what about elephants, tigers, dogs, giraffes, and so forth. I would really love to see the “fossil” trail for every singles species on earth.
Oh - and also an explanation of the “evolutionary step” just before the one that required a male and female for procreation. Which requires genitalia, sexual arousal, desire, sperm, egg, placenta...among other things. An evolutionist cannot and will not answer this question intelligently.
And a PLACENTA? Placental mammals were a rather recent development, as witness the marsupials of Australia who seem to do without one.