A pressure gradient is which of the following?

The following are all types of air masses except:

The Earth is closest to the Sun in:

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

Testosterone is secreted by the

The primary follicle develops from the

The ________ of a sperm contains the enzymes essential for fertilization

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