The Answer is C~ More nitrogen gas became present in the atmosphere 
        
                    
             
        
        
        
Answer:
Preserved Fossil
Explanation:
A preserved fossil, also known as a "true form fossil," is one that remains intact, or nearly intact, because of the method in which it was fossilized. Preserved fossils are rare; most fossils suffer damage from weathering and sedimentation before they are discovered.
  
        
             
        
        
        
Answer:
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Explanation:
 
        
             
        
        
        
Answer:
B
Explanation: I’m just using common sense. If part of the prairie grass is destroyed, that would mean less food for the bison. Which in turn would result in a decrease of Bison?