17. A main function of the digestive system is to -
O
A.
generate white blood cells to destroy any harmful bacteria in food.
B.
generate hormones that are used to stimulate the release of waste.
C.
utilize the lungs for the exchange of carbon dioxide and oxygen.
D.
utilize the small intestine to absorb nutrients from digested food.

D

Explanation:

The main function of the digestive system is to break down and absorb foods and nutrients and digest food.

i think it's they require warm air

explanation:

tornados usually happen when it's raining right so when it's raining it cools down so if the temperature keeps changing then i think a tornado occurs sorry if it's wrong

d

explanation:

the higher the instrument the better