<h2>Answer </h2>
The components of the r group of amino acid structure varies among different amino acids
<u>Explanation </u>
As the functional group for amino acids is as: 
R-CH-COOH
   I
NH2
only R differs so amino acids also differs. If R is “H” then amino acid is glycine and if R is “CH3” then amino acid is alanine. Hence, R is different for different amino acids. Other components as alpha carbon ( C ), carboxyl group ( COOH ) and amino group ( NH2 ) is fixed for every amino acid.  
 
        
        
        
<span>The average human red blood cell is roughly 6 to 8 micrometers wide. The width of a pin is this problem is defined as 1000 micrometers. Assuming we use the smallest size of a blood cell, then we divide 1000 by 6, and we find that roughly 166.66 (or 166 if you are rounding down) red blood cells will fit.</span>
        
             
        
        
        
As the world evolves, there is a change in the ecosystem, and with that comes the fluctuation. Organisms have have changing populations as they adapt, slowly die out, or thrive in the new ecosystem.
        
             
        
        
        
Hello there! 
The most plausible answer here, I believe, would be Polymerase. 
Polymerase is responsible for joining nucleotides to create new strands of DNA, or, replicating. Hope this helps and have a nice day.