Question

Select all of the answers that apply. Which of the following factors caused the early atmosphere to become thicker? volcanic outgassing meteorite and comet impacts cyanobacteria banded iron formations

Answer 1

The answer is

A. volcanic outgassing

C. cyanobacteria

D. banded iron formations

Answer 2

Volcanic outgassing
Cyanobacteria banded iron formation
I think this is correct but I am not fully sure