6. Which of the following describes the function of the
respiratory system?
A. It digests the food that we eat.
B. It regulates the body temperature.
C. It transports blood to all parts of the body.
D. It helps remove carbon dioxide from the body
7. What is the function of the cilia in the nose?
A. adds moisture to the air
B. directs the flow of the air
C. moistens and warms the dust
D. traps particles of dust and air​