The major source of oxygen in Earth's atmosphere is from ______.
A) photosynthesis
B) swamp gas emissions
C) the decay of plants
D) respiration of animals

Question

Quizplus · Accepted Answer

The majority of oxygen in the Earth's atmosphere comes from photosynthesis, which is the process by which plants and other organisms use sunlight, carbon dioxide, and water to produce oxygen and organic compounds.

The Major Source of Oxygen in Earth's Atmosphere Is from ______