Answered

Oxygen levels first rose in the atmosphere because of _____.
A. volcanic outgassing
B. eukaryotes
C. banded iron formations
D. cyanobacteria

Answer :

Flowerly

The answer to your question is going to be option "D."


Oxygen levels first rose in the atmosphere because of (the last option, or "D') cyanobacteria. Cyanobacteria is a type of bacteria that can create toxins that are very dangerous to both humans and animals.


I hope this helps! :)

Hey there!

Your answer = D. Cyanobacteria

They gain their energy through the photosynthesis.

Hope this helped!


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