What graph!? If u want me to answer that u have to include a graph sooooo ya
        
             
        
        
        
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Answer</h2>
It is because of different arrangements of nucleotide bases.
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Explanation</h2>
There are only five types of nucleotide basis are present in the genetic material which makes up the all the genetic information of the individuals. These nucleotides are named as Adenine, Thymine, Guanine, Cytosine and Uracil. In all the living beings on the earth, these only five nucleotides are present which decides their behaviour and functions on the earth. These five bases have features to get any arrangements according to the situation. Their different arrangement at the heredity material makes the difference in all living beings regarding their behaviour.
 
        
        
        
C is your answer :)
And also C and D are true but its C. 
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Answer:
flagella
Explanation:
Some bacteria have tail-like structures called flagella
 
        
                    
             
        
        
        
Answer:
 In species with polyploid, there are more chromosomal sets than in diploid one. Becouse there are more chromosomal structures available,  events like mutation, recombination, DNA lose, are more probable to occur.
As the generations pass, the accumulation of these changes tend polyploid to speciation.