Wait What....Everyone was female once.

Sorry to hurt our manly sentiments but we were all females once.

We all have a common basic knowledge about chromosomes. I'm sure it took you few hours to learn that long biology answer in your school which dealt with natural gender determination due to XX (female) , XY(Male) set of chromosomes.

So when in embryo stage, every human is a female during initial phase of 6–8 weeks after which, if Its a male, Y-chromosome kicks in.

Technically speaking, the embryo is undifferentiated (though it takes chromosomes from the mother and father to make the pair), but I’m addressing the conceptual flaw of “men came first” here, not the medical technicalities. The thing is, the Y-chromosome is the only chromosome that determines whether the embryo becomes a male, therefore the “default” will be the only other option: female.

So Men (few) ?, how's your “I am a man hence superior” mentality after knowing you were female once? (just kidding guys, I know we all(maybe) respect ladies.)