Many clinicians diagnose disorders by using criteria listed in the DSM-5. The DSM-5 is the abbreviations for the diagnostic and statistical manual of mental disorders, it is the handbook used by the healthcare professionals as the guide to the diagnosis of mental disorders. It contains descriptions, symptoms, and other criteria for diagnosing mental disorders.
4. DNA sequence comparison
5. Random mutations
I think the answer would be A
Yes you can. The atomic mass measured from the proteins and neutrons in an atom, since you know he number of protons, you can subtract and be left with the number of neutrons.