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Diffusion of oxygen and carbon dioxide across cell membranes occurs most during _______. Select one: a. ventilation b. internal respiration c. movement of air from the nose to the nasal cavity d. both a and b

Sagot :

Xhade
the correct option is D) both a and b ..
because during internal respiration exchange of gases takes place and during ventilation that is to inhale and exhale air exchange of gases occurs during the movement of air through whole system ..