DNA is created when nucleotides join together into a polynucleotide. Thus, the correct option is D.
What are Nucleotides?
Nucleotides may be defined as a molecule that consists of a nitrogenous base, a phosphate group, and a pentose sugar.
Nucleotides are the monomers of nucleic acids (DNA/RNA). They are joined together by covalent bonds with the help of the phosphate group of one nucleotide and the pentose sugar of another nucleotide.
Therefore, the correct option for this question is D.
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