The process of digestion begins in your ______.

The major job of the ____ is to absorb water from undigested food.

The tube between the mouth and the stomach is the

The major organ of the excretory system is____.

The ____ fight bacteria and viruses.

Blood that is carrying oxygen is said to be

The right ventricle pumps blood to the

How do pairs of skeletal muscles work together?

The pigment melanin in the skin functions to

What is the function of the adrenal glands?

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