Which statement best explains why time of day can be a factor that affects flexibility?

a. circadian rhythm influences body temperature.
b. coordination skills are regulated by balance testing.
c. developmental stretching occurs at the end of a training session.
d. sleep patterns are affected by exercise program.

B is the answer to this

Smoking damages the respiratory system by inhalation of a foreign substance, that is absorbed and residue is left behind on our lungs sponge like substance. the gas that is inhaled also increase your blood pressure and dilates your blood vessels. also the process of inhaling and exhaling the smoke it causes irritation to the throat and mouth. smoking can cause lung cancer and other respiratory and circulatory diseases. 

Trade schools would be the best option