So simple and so WRONG. You think that DNA can tell the difference between
good or bad mutations? It can't. It can tell original from changed. You are just
as likely to remove the few to none beneficial mutations as the 99.99% of bad
mutations.
DNA doesn't tell the difference between good and bad mutations. You're absolutely right about that. LIFE tells the difference between good and bad mutations. Creatures with bad mutations SUFFER. That suffering hinders them from getting more kids. This tends to reduce the amount of DNA with that bad mutation in the FOLLOWING GENERATIONS.
The opposite for good mutations.
Of course, some mutations are just neutral and don't really matter that they happened . . . they don't make a difference after being there.
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