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Diffusion.
diffusion acts passively, and the oxygen and carbon dioxide move to the area of lower concentration
The answer is D because of smoking and the smoke fills places and the smoke is dangerous to breathe in. If you are younger than 18 and are using drungs it is against the law to do that. Finnally they increase spread of disease because you could have too much drugs.
hope this helped :)
alisa202
Answer:
Pulmonary fibrosis
Explanation:
Pulmonary fibrosis occurs when lung tissue becomes damaged and scarred. This thickened, stiff tissue makes it more difficult for your lungs to work properly. As pulmonary fibrosis worsens, you become progressively more short of breath
Answer:
Unfair,unkind and unreasonable.
Explanation:
