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Breathing
Breathing is the movement In animals which brings oxygen to a respiratory surface for gaseous exchange and removal of carbon dioxide
Gaseous exchange
Is the diffusion of oxygen into, and carbon dioxide out of an organism at a respiratory surface
Respiratory surfaces
Small unicellular organisms have a large surface area to volume ratio. Gaseous exchange therefore occurs efficiently across the entire body surface. In larger organisms with a small surface to volume ratio, specialized respiratory surfaces have developed which provide large surface area for gaseous exchange. In many animals the respiratory surfaces form part of the respiratory system
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