True: Diffusion is passive, Alveoli have a moist surface, Arteries carry blood away from the heart, Respiration releases energy from glucose, CO2 is a waste product of respiration, Red blood cells are biconcave, False: Diffusion is active, Alveoli walls are thick, Veins carry blood at high pressure, Respiration is breathing, Water is required for respiration, Red blood cells carry CO2,

Diffusion and gas exchange

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