True , conservation efforts have, they did this by gently helping the bison.
 with the bison we have an specifically  diverse animal , this means that preserving the genetics should be easy.
but it gets harder because of the world around it changing. this means that it has to adapt to a lot of things.  
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I hope this helps you  , really
        
             
        
        
        
Cancer and Tumors...
           ........ Hope it helps, Have a good rest of the day:)
        
             
        
        
        
Answer:
A
Explanation:
photosynthesis converts light energy to chemical energy and not the other way round 
product of photosynthesis is oxygen and energy 
photosynthesis cannot occur is light energy is not available