Multiple choice

Identify the major process that releases oxygen gas into the atmosphere.

  1. Combustion

  2. Photosynthesis

  3. Hydrolysis

  4. Ammonification
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Photosynthesis is the primary biological process that produces oxygen as a byproduct when plants, algae, and cyanobacteria convert CO2 and water into glucose. Combustion consumes oxygen, hydrolysis breaks molecules using water, and ammonification produces ammonia - none release oxygen into the atmosphere.

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