Question

What bodily system does the yolk sac take the place of until it develops?

1) Respiratory system
2) Digestive system
3) Circulatory system
4) Endocrine system

Answer 1

The yolk sac takes the place of the digestive system until it develops fully and the placenta takes over as the source of nutrients for the embryo. Hence the correct answer is option 2

Step-by-step explanation:

The yolk sac develops in the embryonic stage to provide nourishment to the early embryo. It takes the place of the digestive system until it develops fully and the placenta takes over as the source of nutrients for the embryo. The yolk sac also serves as the source of blood cells and germ cells for the embryo.

Hence the correct answer is option 2