Answer:
carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur
 
        
                    
             
        
        
        
Answer:
subsistence agriculture
Explanation:
The land is limited, cultivation systems are basic, and there is not enough harvest to sell.
 
        
             
        
        
        
Answer: Missense mutation 
Explanation:
Missense mutation is a type of point mutation where a single nucleotide is changed to cause substitution of a different amino acid. This in turns render the resulting protein non-functional. 
In the case of sickle-cell disease, the sixth amino acid in the gene sequence, glutamate (GAG) is substituted with valine (GUA), due to Adenine nucleotide changed to Uracil nucleotide. Thus, missense mutation has occurred 
 
        
                    
             
        
        
        
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The mass of the box increased and the acceleration of the box decreased