What does the placenta do? ________________________

Name two things a mother can do to protect her fetus. _________________________

What hormones stimulate the testes to release testosterone? _______________________

People grow the fastest during which stages of life? ________________

When the zygote becomes a ball of cells and implants itself into the lining of the uterus, it is called a __________________________

What happens to sperm in the epididymis? _____________________

When is a fetus most at risk for birth defects? _________________________

cells that surround each egg in the ovaries _______________________

$___________________$ : pit that contains cells producing keratin

What structure helps sperm to penetrate an egg's membrane?
a. vas deferens
b. acrosome
c. testes
d. tail

List the three stages of birth. ________________

a series of monthly changes in females _______________________

Choose the correct term from the list for each description.

the structure that connects the embryo to the placenta _________________

$___________________$ : includes the bones and connective tissues