Diffusion - This is when a substance spreads out from high concentration to low., Carbon Dioxide - This gas is produced by respiration and diffuses out of the blood and into the lungs to be exhaled., Oxygen - This gas is used in respiration and diffuses into the blood from inhaled air in the lungs., Water Vapour - This is also produced in respiration and can be seen as a cloud when we exhale on cold days.,

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