Question

Many factors are thought to have contributed to the formation of the Earth's atmosphere. Choose ALL that apply.E) The early Earth atmosphere formed mainly from gases spewed from volcanoes.
A)The early Earth atmosphere formed mainly from gases produced by cyanobacteria.
B)The current atmosphere contains more carbon dioxide than the earliest atmosphere.
C)Plants are responsible for bringing atmospheric oxygen up to its current level.
D)Cyanobacteria are responsible for first adding oxygen to the Earth's atmosphere.

Answer 1

Answer:

Cyanobacteria are responsible for first adding oxygen to the Earth's atmosphere.