Question

PLEASE HELP!!!! Which of the following were responsible for changing the oxygen content in

Earth's atmosphere from no oxygen to 21% oxygen?
A. Prokaryotes
B. Eukaryotes
C. Ribozymes
D. Protobionts

Answer 1

prokaryotes

Step-by-step explanation:

i took the quiz

Answer 2

Im not 100% sure but the best answer I can give is Prokaryotes because they came to be around the time oxygen did as well.