The mass is made up of protons and neutrons, the valence electrons only determine stability, not mass
        
             
        
        
        
Answer:
Individual Characteristics are properties of physical evidence that can be attributed to a common source with a high degree of certainty. Examples of individual evidence include anything that contains nuclear DNA, toolmarks, and fingerprints.
Explanation:
 
        
                    
             
        
        
        
Answer: Purine; is equal to; pyrimidine
Explanation:
When a segment of DNA is examined then the nucleotide in one DNA molecule, it will be expected that the sum of purine in one strand will be equal to the sum of the pyrimidine in the other strand. 
Adenine combines with Thymine and Cytosine combines with Guanine in 1:1 ratio.
More specifically the ratio of purine is to pyramidine is 1:1 in an organism. This pattern is seen in both the strands of the DNA.
 
        
             
        
        
        
The answer is Chromosome
A chromosome is a Deoxyribonucleic acid molecule with part or all of the genetic material of an organism.
- R3KTFORGOOD ☕
 
        
                    
             
        
        
        
I think the correct answer from the choices listed above is option D. <span>Astronauts and scientists conduct research studies aboard the International Space Station in a satellite that was built by sixteen nations. Hope this answers the question. Have a nice day.</span>