Multiple choice

What process below releases primarily oxygen into the atmosphere?

  1. Respiration

  2. Osmosis

  3. Combustion

  4. Photosynthesis

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to produce glucose, releasing oxygen as a byproduct into the atmosphere. Cellular respiration and combustion, by contrast, consume oxygen and release carbon dioxide.