When it is March and spring in the Northern Hemisphere, it is __________ and ___________ in the Southern Hemisphere.

The primary force that initially causes air to move horizontally is the:

What type of air mass would be responsible for hot, humid summer weather in the eastern half of the United States?

During dehydration the body would increase production of

The primary follicle develops from the

Testosterone is secreted by the

The uterine phase that develops because of a fall in progesterone levels is the

The ________ of a sperm contains the enzymes essential for fertilization

The hormone that stimulates spermatogenesis in males is

Sometimes prolonged excessive exposure to high hormone concentration causes a phenomenon known as____.