The main function of the respiratory system is to allow the exchange of gases between the atmosphere and the lungs.
Hence,the only structure that carries out this function is the alveoli as other structures such as the nose,trachea and pharynx transport gases to the alveoli just so that it can can out its function.
Answer:
agriculture can cause problems such as less housing, cut down of trees to make way for more agricultural things and the animals causes more droughts. But it helps give people food
Explanation:
Integral proteins span the membrane and peripheral proteins reside on one side or the other.
Can be caused by radiation.
