What is the answer for the two blank lines? (_+_)

CO2 + H2O is the answer

Air enters through the nose (and sometimes the mouth), moves through the nasal cavity, the  pharynx, the  larynx, enters the  trachea, moves through the  bronchi  andbronchioles  till the alveoli.

Your answer would be, the process of thermal expansion, and contraction, is one form of mechanical weathering. which is where the substance as been heated, and it expands; as the substance cools, it contracts.hope that