A small point that gets missed about evolution is that all a mutation needs to continue to be passed on is that mutation doesn't prevent the mutant from breeding successfully.
This allows some intermediate mutations that allow future mutations to be advantageous.
There have been a few creationists who have claimed that for evolution to be true, all mutations must be advantageous. That's not true. They merely have to not be disadvantageous.
The mutation must allow the mutant to live long enough to breed, and that is all.
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