posted by tzeni .
Why is the placenta unique as to its origin?
A it's the first fetal structure to develop
B it's allows the mixing of oxygen and nutrients between mother and child
C its develops from material supplied both by the mother and the fetus
D it provides the fluid that surrounds and protects the embryo
i believe the correct answer is D
The question is asking what is unique about the ORIGIN of placenta, that to me points to C because that is the answer that relates to the origins of the placenta in development