What is the function of the placenta? A. To protect the developing fetus
B. To help the developing fetus communicate with the mother
C. To hold the developing fetus in place
D. To provide the developing fetus with food, water, and oxygen

it's either a or d I know this I'm in child development but I'm pretty sure it's a d but it might help protect the fetus because it's trying to keep it attached and keep it from floating around but it could be d because to provide developing food water and oxygen that would be the only way it could breathe and that's how it gets his nutrients because when the mother is breathing in oxygen and eating that's how the baby gets to take in all that stuff with the mother

not sure if this is what you'r looking for eubacteria and archaebacteria