The Indifferent Stage of Embryonic Development

Your reproductive system is the only organ system that does not care about keeping you alive.

Its entire job is just to keep the human species going, not you specifically. But the craziest

part is how it starts. For the first seven weeks in the womb, every single embryo looks exactly the

same in what is called the indifferent stage. You have the potential to be anything until

hormones kick in. If the Y chromosome doesn't send a signal to make testosterone, you automatically

develop female parts. Nature basically defaults to female unless told otherwise.