Answer:
i really want to help, but i am not able to go to your profile. let me try again
 
        
                    
             
        
        
        
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.
 
        
                    
             
        
        
        
Answer: burning processes, such as backyard burning and commercial or municipal waste incineration.
the use of fuels, such as wood, coal, or oil.
natural phenomena, such as volcanic activity and forest fires.
industrial processes, such as chlorine bleaching of paper pulp and smelting.
Explanation:
Hope I gave you the answer you are looking for :) LMK
 
        
             
        
        
        
Answer:
The correct answer is A
Explanation:
Eukaryotic cells have a nucleus containing their DNA, whereas prokaryotic cells do not have a nucleus. 
 
        
                    
             
        
        
        
Answer:
Life Processing I Learnes this last year in 7 grades