Heather Radke

To block those claws from getting in.

To block those claws from getting in.

To block those claws from getting in.

It keeps digging. But then the uterus blocks it.

It keeps digging. But then the uterus blocks it.

It keeps digging. But then the uterus blocks it.

And the uterus keeps blocking it, blocking, blocking it.

And the uterus keeps blocking it, blocking, blocking it.

And the uterus keeps blocking it, blocking, blocking it.

It's a really good question, and we will get to it after the break.

It's a really good question, and we will get to it after the break.

It's a really good question, and we will get to it after the break.

So you all actually already answered this question on the show. Oh.

So you all actually already answered this question on the show. Oh.

So you all actually already answered this question on the show. Oh.

So basically the story we told then is that before placentas, all animals that would become mammals laid eggs. And an egg is a special little thing. It's a self-contained little package where the fetus has everything it needs to eat until it's ready to hatch and all of its waste products stay inside the egg and nothing comes in and nothing goes out until the animal is ready to leave its egg.

So basically the story we told then is that before placentas, all animals that would become mammals laid eggs. And an egg is a special little thing. It's a self-contained little package where the fetus has everything it needs to eat until it's ready to hatch and all of its waste products stay inside the egg and nothing comes in and nothing goes out until the animal is ready to leave its egg.

So basically the story we told then is that before placentas, all animals that would become mammals laid eggs. And an egg is a special little thing. It's a self-contained little package where the fetus has everything it needs to eat until it's ready to hatch and all of its waste products stay inside the egg and nothing comes in and nothing goes out until the animal is ready to leave its egg.

an ancient proto-mammal and changed its DNA so that eventually, many generations later, the eggshell transformed from a hard shell that exists outside the body to a sort of permeable layer that exists inside the body, which then becomes the placenta. And this was a huge advantage because it made it possible for the blood of the mother to actually feed the fetus.

an ancient proto-mammal and changed its DNA so that eventually, many generations later, the eggshell transformed from a hard shell that exists outside the body to a sort of permeable layer that exists inside the body, which then becomes the placenta. And this was a huge advantage because it made it possible for the blood of the mother to actually feed the fetus.