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4.) What is a circulatory system?

A The body's breathing system

B.The body system off nerves

C.The food processing system

D. The body's blood-transporting system

5.) What is the function of the tonsills?

A They vibrate in order to produce sound.

B. They prevent food from entering the windpipe.

C. They warm and moisten the air that enters through the nose.

D. They trap and destroy the bacteria that enters through the nose and the mouth.

6.) What happens during inhalation?
A Air rushes out of the lungs,

B. The ribs and diaphragm relax

C. The ribs and diaphragm contract

D. The chest cavity become smaller.​