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GASES IN THE ATMOSPHERE What are the basic things you need to survive? Atmosphere: the layers of gas that surround the Earth gases Other: argon, carbon dioxide, water vapor, neon, helium, krypton, xenon, methane, hydrogen, ozone nitrogen oxygen other Oxygen-Carbon Dioxide Cycle When animals and people breathe in air, their bodies use the oxygen to change their food into energy. When they breathe out they release carbon dioxide. Plants take in the carbon dioxide and use it with water and the suns energy to make sugar and oxygen. They use sugar and release oxygen for animals. CYCLE CONTINUES Nitrogen Cycle All living things need nitrogen. Most living things cannot use nitrogen gas directly from air. However, bacteria in the soil can use this form of nitrogen. Animals take in nitrogen when they eat plants or plant eating animals. It is returned to soil when animals die or animal waste. Bacteria in soil break these down releasing Nitrogen in air and soil.