The answer is Habitat. I'm 100% sure it is.
        
                    
             
        
        
        
Answer:
Definition: The amount of carbon dioxide and other carbon compounds emitted due to the consumption of fossil fuels by a particular person, group, etc. 
 
        
             
        
        
        
Explanation:
nitrogen is converted from atmospheric nitrogen +N2) into usable forms ,such as NO2,- in a process known as fixation.
 
        
             
        
        
        
Answer:
Photosynthetic autotroph
Explanation:
Plants, algae/seaweed and some bacteria can use photosynthesis to turn light energy, carbon dioxide and water into glucose and oxygen. The glucose, or sugar becomes the food for these organisms. 
Since they can produce their own food, they are called producers, but they are also called autotrophs. "Auto" meaning self, and "troph" meaning nutrition. Therefore, the correct choice is: Photosynthetic autotroph.