Thinking back...
Thinking all the way back to the literal first human mother: Mitochondrial Eve. She was an actual, specific female, the only one whose particular genetics is within every human being in the world, past, present, and future. Every human on earth is descended from this one early human mother. Don't ask me how the science goes that works it out, my thinking apparatus doesn't keep all the details in order, but a search on-line can get you there if you want to know. An easier concept, related, is... Sign in to see full entry.