Answer: light energy into chemical energy
Explanation:
Carbon fixation is also referred to as carbon assimilation is simply defined as the conversion by living organisms of inorganic carbon to the organic ones. 
It has to do with the conversion of light energy into a chemical energy. When the conversion takes place, the compounds will then be used for the storage of energy. 
 
        
             
        
        
        
Coal. -from my dad lol ill check
        
                    
             
        
        
        
I think the answer is cellular
        
                    
             
        
        
        
The reason why humming birds need long beaks is to be able to get the nectar from the flowers, kind of like how we need straws to drink out of to go cups. Humming birds also have very long tongues that also help this process. Since humming birds beaks help them get the food they need, it makes them more successful in their environment.