How the evolution of photosynthesis dramatically..

[tomkkk]

and permanently changed Earth's atmosphere?

[canalon]

The light reflected by the green pigment made the sky look blue, before it was yellow...

FFS, can you do a bit of research before asking your question?

[Darby]

You're kidding about the sky, right...?

[canalon]

No I am always dead serious when some lazy student cut and paste his/her homework question in a subject and expect to be spoonfed the answer.