Here's why:

* Nucleic acids are complex organic molecules that carry genetic information.

* There are two main types: DNA and RNA.

* DNA uses deoxyribose as its sugar molecule, while RNA uses ribose.

The difference between deoxyribose and ribose is a single oxygen atom. Deoxyribose has one less oxygen atom than ribose. This small difference gives DNA its unique properties, including its greater stability, which makes it well-suited for long-term storage of genetic information.