In common parlance, something is perfect if it has no mistakes, errors. Very good would indicate a few mistakes or errors.
As for mutations, they can increase fitness which would move it closer to very good.
He actually is returning for a church without spot, blemish or wrinkle. He will: "transform our lowly bodies so that they will be like his glorious body." So we will no longer have to endure the weakness of the flesh.
So we've been told for 1,500 years. Don't expect us to take it seriously.
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