An oil-spill is the massive release of liquid petroleum hydrocarbon into the environment. It usually occurs in the sea. It is due to human activity and causes pollution. The environment is highly affected on this situation. Large-scale oil-spill affects the environment in various ways such as death of several sea creatures such as fishes. It could also lead to contamination of our seafood. and it also cause a long-term damage to the food chain. 
        
             
        
        
        
Nucleic acid<span> typically contain phosphorous, and nitrogen plays an important structural role in nucleic acids and proteins. The proteins, being made up a diverse set of amino acids, have, in addition to carbon, hydrogen, oxygen, and nitrogen, the elements sulfur and selenium.</span>
        
                    
             
        
        
        
Because the chain will begin to shut down and will no longer pump [H+] (hydrogen ions) across the membrane; thus, the proton gradient can not be maintained. 
:) I hope this answers your question!
        
             
        
        
        
I think <span>climate change</span>