An early consequence of the release of oxygen gas by plant and ...

[penguins]

An early consequence of the release of oxygen gas by plant and bacterial photosynthesis was to
A) generate intense lightning storms.
B) change the atmosphere from oxidizing to reducing.
C) make it easier to maintain reduced molecules.
D) cause iron in ocean water and terrestrial rocks to rust (oxidize).
E) prevent the formation of an ozone layer.

[Millan]

I know it's D, we did this last week

[penguins]

Thank you, thank you!!