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It is never ending but technically starts with
1. Sunlight
2. Photosynthesis
3. Mammal Respiration
4. Plant Respiration
And the cycle repeats

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http://www.encyclopedia.com/social-sciences/applied-and-social-sciences-magazines/carbon-dioxide

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https://www.purposegames.com/game/carbon-oxygen-cycle-quiz

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http://www.chemicool.com/elements/oxygen-facts.html

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One fifth of the Earth's atmosphere is made up of oxygen and is the third most abundant element in the universe by mass.

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Carbon dioxide (CO2) is, along with oxygen and nitrogen, one of the major atmospheric gases. I t is vitally important for all living things

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Carbon and oxygen are two elements that are essential to life. They are naturally present in the atmosphere in the form of carbon dioxide and gaseous oxygen. Due to their constant circulation between the soil, air, and water--through processes such as photosynthesis and combustion--living matter is constantly renewed.

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When plants create oxygen, they combine water with carbon dioxide releasing oxygen into the atmosphere. When humans and other animals inhale oxygen, it combines with carbon from the food we eat and is exhaled as carbon dioxide.