<span> Endoplasmic Reticula should be the answer but if it is not my apologies </span>
Answer: C
Explanation: I took the test hoped this helped :)
It's the nucleus as it contain the DNA
I think the correct answer would be A. The yolk sac becomes the placenta. It is membranous sac that is attached to the embryo. It provides all the nutrition and the blood cells needed by the embryo. It is also called the umbilical vesicle.
