We know that height in humans is a polygenic trait because it has a lot of variation. The height gene is controlled by at minimum three genes with six different alleles. If all of these alleles are dominant for the tall gene you will be tall if you are dominant for the short gene you will be short if there is no clear dominance between the two genes you will fall somewhere  in the middle. 
        
             
        
        
        
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B. Different genes are expressed due to their environment.
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I think it's this one because it makes the most sense, but I'm still not sure sorry
 
        
                    
             
        
        
        
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A hydrogen atom is an atom of the chemical element hydrogen.Carbon is a chemical element with the symbol C and atomic number 6. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds.
In chemistry, an element is a pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei.
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Explanation:
Axial part : includes the head, neck, and trunk.
 
        
             
        
        
        
Mitochondria have two membranes, an outer membrane and an inner membrane. ... It is also where many other chemical reactions take place to carry out the mitochondria's many functions. An increased surface area creates more space for more reactions to occur, a