How did DNA evolve?

DNA Evolve:

1. A significant development in the history of life was the switch from the RNA to the DNA world.
2. Enzymatic activities were necessary for the synthesis of DNA precursors, the reverse transcription of RNA templates, and the replication of single-stranded and double-stranded DNA molecules.
3. Recent findings from comparative genomics, structural biology, and conventional biochemistry show that a number of these enzymatic activities were independently created more than once, proving that the transition from RNA to DNA genomes was more complicated than previously believed.
4. It is unclear how the three domains of life—Archaea, Eukarya, and Bacteria—distribute the various protein families that correspond to these activities.
5. DNA, or deoxyribonucleic acid, is the hereditary material found in both prokaryotic and eukaryotic cells and is found within the cell's nucleus.
6. Except for red blood cells, every cell has a copy of our DNA and is inherited from our parents.
7. It is the double helix, a biological structure made up of two single strands linked together by hydrogen bonds and made up of four different types of nitrogen bases: adenine (A), cytosine (C), guanine (G), and thymine (T). The structure of these double helix DNA molecules resembles a twisted ladder.
8. As we all know, scientists James Watson and Francis Crick discovered DNA and were awarded the Nobel Prize in 1962 for their discovery of DNA structure.
9. In truth, the DNA molecule had been identified for decades.