Which of the Following is Not a Part of an Egg

Question

Which of the following is not a part of an egg with a calcium-hardened shell?  
A) Placenta
B) Amnion
C) Chorion
D) Allantois
E) Yolk sac

Accepted Answer

The placenta is not part of the egg structure. It is a unique structure found only in mammals that connects the developing fetus to the mother's uterine wall.