Question

Help quick please!! Thanks

Answer 1

The answer is oxygen bro

Answer 2

Answer: Oxygen

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Respiration is the use of oxygen to produce energy. Oxygen, or $O_2$, is also created as a by-product of photosynthesis during the light-dependent reactions. The photolysis, or breaking down of water, H2O, during photosynthesis, created oxygen as a by-product.