Answer:
This composition of nucleotide given in the question do not obey the chargaff"s rule.
Explanation:
According to chargaff"s rule the total number of purine bases will be same to the total number of pyrimidine bases that is 
           Adenine+Guanine=Thymine+Cytosine 
But here the above quation is not maintained because according to the question A+G=49%
         and T+C = 51%.
Such DNA is replicated by rolling circle model.
 
 
        
             
        
        
        
Answer: decide if the trait is helpful for the organism
observe the traits of the organism's children
Explanation:
I think those are the 2
 
        
                    
             
        
        
        
The answer to your question isFossilized dung