Question

question 1
the placenta:
provides the embryo with oxygen and removes waste products.
mixes the blood supply of mother and fetus.
screens the embryo from all harmful substances.
provides the fetus with its first taste of breast milk.

Explanation:

The placenta is an organ that develops during pregnancy. It facilitates the exchange of oxygen and nutrients from the mother to the embryo and removes waste products from the embryo. The blood supplies of the mother and fetus do not mix directly. It also cannot screen out all harmful substances. And it has no role in providing breast - milk taste to the fetus.

Answer:

provides the embryo with oxygen and removes waste products.