Answer:
G1
Explanation:
G1 takes up half the chart so it only makes sense for that to be the answer 
 
        
                    
             
        
        
        
Answer:
Explanation:
In a lake, oxygenic phototrophs produce new organic material as  well as O₂. If primary production rates are very high, the resultant  excessive organic matter production can lead to bottom-water O₂ depletion from respiration and the development of anoxic conditions.  This in turn stimulates anaerobic metabolisms, including  anaerobic respirations and fermentations.
Organic matter that is not  consumed in surface layers sinks to the depths and is decomposed  by anaerobes.
 
        
             
        
        
        
Answer:
The answer is autotrophs
Explanation:
During the early days of the Earths life there was no oxygen but there was plenty of CO2 which the autotrophs took and used as food while discarding the excess which was the oxygen. 
 
        
             
        
        
        
C is the correct answer because it is what that determines the gene