The major biological source of oxygen, which many organisms require when they break down glucose, is actually a by-product of:
A) cellular respiration
B) chemosynthesis
C) entropy
D) photosynthesis
E) global warming

Question

Quizplus · Accepted Answer

Oxygen is produced as a by-product of photosynthesis in plants and other autotrophic organisms. During photosynthesis, carbon dioxide is converted into glucose and oxygen gas as a waste product. This oxygen is then released into the atmosphere, where it is used by other organisms for cellular respiration.

The Major Biological Source of Oxygen, Which Many Organisms Require