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Animal/Plant Gas Exchange Our planet is lively in many ways. Everything on Earth is part of one system, so Gas Exchange could be discussed under Cycles, Interliving, or under Balance. Everything really is connected to everything else. Every living organism must exchange gases to stay alive. We each take in a gas (breathing) we need from the atmosphere, use it to make food or transform food, and release the leftover part of the gas, which the living cells have chemically changed into a different gas. Animals take in oxygen gas, transfer it to their blood, and carry it to every cell, where it is used to transform food into energy, where carbon dioxide gas is created as a by-product or leftover. This is called respiration. This carbon dioxide is released into the air. Plants and algae breathe in carbon dioxide and carry it to every green cell, where it is used to transform...

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