What component of Earth's atmosphere exists entirely as a result of photosynthesis?

oxygen gas
water vapor
nitrogen gas
carbon dioxide gas

Oxygen gas

Explanation:

Photosynthesis is where carbon dioxide, water, and sunlight are turned into oxygen, and glucose (energy for the plant). The only gas released is oxygen.

c

explanation:

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affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.