The answer is c, relying on renewable energy sources 
        
             
        
        
        
Methane composes most of the natural gas.
        
                    
             
        
        
        
That would be true, since most other stats include helium, calcium, etc
        
                    
             
        
        
        
Answer:
iron (III) oxide is a gas
 
        
             
        
        
        
Answer:
its already in scientific notation form however its ordinary or real form is -0.005682
Explanation:
scientific notation 
when a number is expressed with some power of 10 multiplied by a number between 1 to 10 is called scientific notation