_____ refers to the sac in which the fetus develops.

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The amnion refers to the sac that surrounds and protects the developing fetus. It is filled with a fluid called amniotic fluid, which acts as a cushion for the fetus and helps maintain a stable environment for growth and development. The placenta is an organ that connects the fetus to the uterine wall and allows for exchange of nutrients, oxygen, and waste products between mother and fetus. The zona pellucida is a layer of proteins that surrounds the egg cell and helps prevent polyspermy (fertilization by multiple sperm). The chorion is a membrane that surrounds the amnion and helps form the placenta. The umbilical cord connects the fetus to the placenta and contains blood vessels that transport nutrients and oxygen to the fetus and remove waste products from the fetus.

_____ Refers to the Sac in Which the Fetus Develops