Here's why:

* DNA is the blueprint of life: It contains the instructions for building and maintaining an organism.

* Genes are segments of DNA: These segments code for specific traits like eye color, hair texture, or disease susceptibility.

* Chromosomes are organized structures of DNA: They are essentially long, coiled strands of DNA that are packaged together.

* Genome: The complete set of genetic material (DNA) in an organism is called its genome.

So, while chromosomes and genomes are also involved in the storage and organization of genetic information, DNA is the fundamental molecule that holds all the genetic instructions.