Question

describe how the placenta keeps the young alive before birth.

Explanation:

The placenta is an organ that forms in the uterus during pregnancy. It is attached to the wall of the uterus and connected to the fetus by the umbilical cord. The placenta allows oxygen and nutrients to pass from the mother's blood to the fetus's blood. It also removes waste products from the fetus's blood.

Answer:

The placenta allows oxygen and nutrients to pass from the mother's blood to the fetus's blood. It also removes waste products from the fetus's blood.