Explain in brief the transport of carbon-dioxide and oxygen across the cell membrane bio.

i think that d. wind is the answer.   i missed the question when i answered a. currents.

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.

its probably to later but whats the question

air enters through the nose, moves through the nasal cavity, the pharynx, the larynx, enters the trachea, moves through the bronchi andbronchioles till the alveoli.