Answer:
This question is incomplete as it lacks options. However, it can be answered based on general knowledge of the DNA structure. 
Hydrogen bonds in a DNA are located between the nucleotides that holds the double stranded DNA molecules.
Explanation:
Deoxyribonucleic acid (DNA) is the genetic material in living cells. The DNA molecule is made up of nucleotides monomers. However, since the DNA molecule is double-stranded, the nucleotides are of two chains composed of four nucleotide subunits viz: Adenine (A), Thymine (T), Guanine (G) and Cytosine (C). 
The two chains of nucleotides in a DNA molecule are called strands. Each strand is bonded to one another by the nucleotides using complementary base pairing i.e. A-T, G-C. The bonds between the nucleotidew of each strand is called HYDROGEN BOND. 
Hence, HYDROGEN BONDS in a DNA molecule is located in between two nucleotides of each strand. That is, hydrogen bond holds Adenine to Thymine and Guanine to Cytosine. 
 
        
                    
             
        
        
        
This one would be amplitude. The reason is because amplitude is the distance from the center of the wave to the farthest point on the wave. So, if the amplitude of a wave is, say, 5m, the distance between the center of the wave and the top (or bottom) would be 5 meters. And to find the total height, just double the amplitude.
        
             
        
        
        
<em><u>what is dormancy:
</u></em><em>it is the stage before seed germination in which no growth or development of seed takes place and they disperse.......
</em><em><u>advantage:
</u></em><em><u />this stage is necessary for the seed to get a suitable environment and conditions for germination...
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Most of the nitrogen in earths atmosphere comes from bacteria.