During superposition of a wave such as that of the oceans, when the crest and the trough meet, then they cancel out into the period. If two crests meet up, they add up to a crest that’s equivalent to the summation of their amplitudes. This is also true when two troughs meet up. 
 
        
             
        
        
        
Answer:
C) Use alternate green power resources to avoid emissions.
Explanation:
 
        
             
        
        
        
4 because the distance is 40 and it hit the ground in 5 seconds
        
             
        
        
        
Answer: cellular metabolism
Explanation:
Cellular metabolism is chemical reactions that takes place in living organisms so that they will be able to maintain life. Cellular metabolism is made up of thousands of genes, metabolites and proteins.
Cellular metabolism is affected by the sympathetic nervous system but is not affected by the parasympathetic nervous system.