When a baby girl is born, she comes into the world with every single egg cell that she'll ever need during her life. Every chance she'll get to one day become a mother. These cells stay locked away until adolescence but they're all still in there. They form in utero which just blows my mind. Even before they're born, girl babies have them all stacked up for one one day in the distant future.
It makes me think of those Russian nested dolls. Inside one lives a smaller one. Inside that smaller one is another smaller still.
It's strange to me that life arranges itself in this way but it's been doing so for many millennia so it must be a pretty good system.
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