Question

at the placenta, __________. a oxygen enters the fetal circulation b nutrients enter the fetal circulation c nitrogenous wastes enter maternal circulation d all apply.

Explanation:

The placenta is an organ that connects the developing fetus to the uterine wall. It allows for the exchange of substances between the mother and the fetus. Oxygen and nutrients from the mother's blood enter the fetal circulation. Nitrogenous wastes from the fetal blood enter the maternal circulation.

Answer:

D. All apply.