The universal genetic language of DNA is common to virtually all organisms on Earth, however diverse. What is the best explanation for this fact?

Question

All living things share a common genetic language of DNA because they share a common ancestry.
The universal nature of the genetic language of DNA is due to coincidence.
The universal genetic language is explained by the chemistry of DNA and proteins.

Answer 1

The best explanation for the fact that the universal genetic language of DNA is common to virtually all organisms on Earth is:

All living things share a common genetic language of DNA because they share a common ancestry.

This explanation is supported by the theory of evolution, which posits that all living organisms have descended from a common ancestor. Over billions of years, while mutations and adaptations have led to the diversity of life we see today, the fundamental genetic code remains largely consistent. This common genetic language emphasizes the shared evolutionary history among different life forms.