Question

Which process is most responsible for the increase in early Earth’s atmospheric oxygen levels?

Answer 1

Answer: B). Photosynthesis

Explanation:

Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organisms' activities.

Answer 2

The answer is photosynthesis.

Photosynthesis occurs in the leaves of green plants. During photosynthesis, carbon dioxide and water are converted into using the energy of sunlight to glucose and oxygen. After great evolution of plants, the photosynthetic rate was increased. More plants mean more oxygen produced in the process of photosynthesis. Thus, photosynthesis  is most responsible for the increase in early Earth’s atmospheric oxygen levels.