Oxygen in Earth's atmosphere is derived from ________.
A)volcanic outgassing
B)photosynthesis
C)animal respiration
D)evaporation

Question

Quizplus · Accepted Answer

Oxygen in Earth's atmosphere is mainly derived from photosynthesis carried out by plants, algae, and some bacteria. During photosynthesis, these organisms use energy from the Sun to convert carbon dioxide and water into glucose and oxygen. The glucose is used as food for the organism, while the oxygen is released into the atmosphere as a waste product. Over time, this process has led to the buildup of oxygen in the atmosphere, making it the most abundant gas present.

Oxygen in Earth's Atmosphere Is Derived from ________