Answer:
It contains Uracil (U) instead of Thymine (T).
Reason for primer removal:
This is because of their uracil nucleotide which is absent in DNA. Instead of Uracil DNA contains Thymine nucleotide.
Explanation:
Primers:
Primers are a short sequence of RNA. These sequences attached to the 5' end are the requirement of DNA polymerase to start the process of replication. 
Primer removal:
After replication, these short fragments of RNA are removed to replaced with DNA from the newly synthesized DNA strand. 
Reason for primer removal:
This is because of their uracil nucleotide which is absent in DNA. Instead of Uracil DNA contains Thymine nucleotide.
Best Answer:
Because It contains Uracil (U) instead of Thymine (T).
 
        
             
        
        
        
Here is what I found, its quite interesting, I hope it helps..
https://www.fbi.gov/services/laboratory/biometric-analysis/codis/codis-and-ndis-fact-sheet
 
        
             
        
        
        
<h2>J-shaped growth curve</h2>
Explanation:
- J- shaped growth curve A curve on a graph that records the circumstance wherein, in another condition, the population thickness of a living being increments quickly in an exponential or logarithmic structure, yet then stops unexpectedly as ecological opposition (for example regularity) or some other factor (for example the finish of the reproducing stage) unexpectedly gets compelling. 
- Population numbers regularly show extraordinary variance, giving the trademark 'blast and bust' patterns of certain bugs, or the ones seen in algal sprouts. 
- This kind of population development is named 'thickness autonomous' as the guideline of development rate isn't attached to the population thickness until the last accident
 
        
        
        
The answer is C. It eliminates the toxic chemical problem. Hope this helps!