A mutation is almost exclusively an insertion or deletion of a protein in the DNA sequence. To think that all mutations are bad or deleterious to the host is incorrect. They certainly can be harmful or fatal but aren't always.
Sherpas are born with substantially larger lungs than non Sherpas. That's an evolutionary change not a function of acclimatization.
�Politicians are the lowest form of life on earth. Liberal Democrats are the lowest form of politician.� �General George S. Patton, Jr.
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~Molɔ̀ːn Labé Skýla~
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