What is DNA's role in facilitating the evolution or extinction of all biological life forms?

Question

What is DNA's role in facilitating the evolution or extinction of all biological life forms?

Answer 1

Considering the fact that our bodies are constantly forming mutating cells...and our bodies natural reaction is homeostasis...you tell me

Answer 2

Differing genes in a population spawns different phenotypes. If one of those phenotypes is reproductively advantageous over others, the genetics coding for that phenotype will likely have a higher frequency in future populations. That is the general basis of microevolution from which logically follows macroevolution.

Genes themselves will not typically cause the extinction of a species. Instead a failure to adapt to a changing environment or compete in a niche will cause extinction. Adaptive genes in a population can help prevent such extinction.