Question

What changes occur to help the develop embryo in the mother? What is a placenta?

Answer 1

Development of amniotic sac which surrounds the fetus during pregnancy and the formation of umbilical cord which connects the mother to the fetus for the exchange of nutrients and other waste materials.

Placenta is the flattened circular organ that is attached to the uterus that protects the fetus from mechanical shocks and other injuries...