Question

which biological process is the main source of atmospheric oxygen?

1. respiration
2. photosynthesis
3. hydrolysis
4. synthesis

Explanation:

• Respiration consumes oxygen and produces carbon dioxide, so it's not a source of atmospheric oxygen.
• Photosynthesis is the process by which plants, algae, and some bacteria use sunlight to convert carbon dioxide and water into glucose and oxygen. This process releases a large amount of oxygen into the atmosphere, making it the main source of atmospheric oxygen.
• Hydrolysis is a chemical reaction involving the breakdown of compounds with water, and it doesn't produce significant amounts of atmospheric oxygen.
• Synthesis is a general term for building compounds and doesn't specifically refer to a process that produces atmospheric oxygen.

Answer:

1. photosynthesis