Which of the gases listed below has accumulated in the atmosphere as a result of biological processes?

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Oxygen is produced by photosynthesis, a biological process that occurs in plants, algae, and some bacteria. It is released into the atmosphere as a waste product and has accumulated over time to make up about 21% of the Earth's atmosphere. Argon, nitrogen, and water vapor are not primarily produced by biological processes. Nitrogen, however, is also released into the atmosphere as a waste product of certain bacteria and is an important component of the nitrogen cycle.

Which of the Gases Listed Below Has Accumulated in the Atmosphere