Eli5: How do bones and other organs know what shapes to grown into?

Question

Eli5: How do bones and other organs know what shapes to grown into?

In: 3675

Answer 1

Basically you start off as a butthole but all of your cells are pre-programmed (they are called stem cells) to know what kind of cell to turn into. It might be a bone cell, might be a hair cell, might be an organ cell