If cyanobacteria never evolved during Earth's history, how would their absence affect the composition of Earth's atmosphere?
A)There would be less nitrogen in the atmosphere.
B)There would be less carbon in the atmosphere.
C)There would be less oxygen in the atmosphere.
D)There would be less methane in the atmosphere.
E)There would be less hydrogen in the atmosphere.

Question

Quizplus · Accepted Answer

Cyanobacteria are responsible for the production of oxygen through photosynthesis. If they never evolved, there would be significantly less oxygen in the atmosphere.

If Cyanobacteria Never Evolved During Earth's History, How Would Their