The fact that almost all organisms use the same genetic code is evidence for evolution because it suggests that
- A. all species were created separately
- B. all life shares a common ancestor
- C. mutation is impossible
- D. DNA is chemically unstable
Explanation
A universal code is exactly what common descent predicts: one original system inherited by every branch of life. If organisms had separate origins there would be no reason for bacteria and humans to translate codons identically.
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