Respiratory gases are exchanged between the body fluids of an animal and its environment by

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Respiratory gases are exchanged through diffusion, which is the movement of particles from an area of high concentration to an area of low concentration. This process does not require energy input and is considered a form of passive transport. Osmosis and pinocytosis involve the movement of water and small particles across a membrane, respectively, and are not directly involved in respiratory gas exchange. Active transport requires energy input to move particles against their concentration gradient, which is not the case for respiratory gas exchange.

Respiratory Gases Are Exchanged Between the Body Fluids of an Animal