Gas exchange in animal always involves

Cellular respiration

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Breathing movement

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Active transport of gases

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Diffusion across membranes

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Solution

The correct option is A Cellular respiration
Gaseous exchange in animals is a process involving cellular respiration. The oxygen that is inhaled has to be used in the aerobic respiration for making the energy. The CO $_{2}$ released during the cellular respiration has to be exhaled in the atmosphere.
Hence, the correct answer is 'Cellular Respiration'

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