The answer is D
I took the test and I got this answer, it was correct :)
I don’t care if I get brainliest I just want to help 
 
        
                    
             
        
        
        
Answer:
Fossil Fuels have the ability to pollute and trash our ecosystems. Its better for us to use clean and renewable energy too.
Explanation:
 
        
             
        
        
        
H2O means water, which is made of two hydrogen and one oxygen atoms.
Oxygen is a gas that your body needs to function. Oxygen comes from the air.
        
                    
             
        
        
        
Yes because some work harder than others to get their credit for developing the periodic table