Here's how it works:
* The yolk: This is a large, nutrient-rich structure within the egg. It contains proteins, fats, vitamins, and minerals that the developing embryo needs to grow.
* The yolk sac: The embryo is attached to the yolk sac, a membrane that surrounds the yolk.
* Absorption: The embryo absorbs nutrients from the yolk through the yolk sac, using blood vessels that connect the two.
So, in a nutshell, the yolk is like a giant, nutritious meal for the embryo, providing all the food it needs until it hatches.
