Here's why:

* Location: DNA is located within the nucleus of eukaryotic cells, organized into structures called chromosomes.

* Structure: DNA is a double helix, with two strands of nucleotides linked together by hydrogen bonds.

* Function: DNA carries the genetic instructions for the development, functioning, and reproduction of an organism.

While eukaryotes also have RNA (ribonucleic acid), RNA is not the primary genetic material. RNA is a molecule involved in protein synthesis and other cellular processes, but it is synthesized from DNA.