Answer:
Carbon dioxide is a gas consisting of one part carbon and two parts oxygen. It is one of the most important gases on the earth because plants use it to produce carbohydrates in a process called photosynthesis
Explanation:
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Hes trying to infer the density of oak trees (:
        
             
        
        
        
It's B. 10 to 20 percent. 
        
                    
             
        
        
        
Hollow, that's why birds can fly. There is nothing in the bone to weigh them down.