What two gases are cycled through ecosystems?

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Each year, photosynthesis fixes carbon dioxide and releases 100,000 megatons of oxygen to the atmosphere. Respiration by animals and living organisms consumes about the same amount of oxygen and produces carbon dioxide in return. Oxygen and carbon dioxide are thus coupled in two linked cycles.

Explanation:

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Aizawa is here

3 hours because it is a decent distance.

the ratio of the conjugate base to the acid required to attain the desired ph.