Sorry about your news, fingers crossed for a good outcome for you. As to your question, I have often thought that the human body is grossly over engineered! 😉
Oh sorry, though. My Dr.of Anatomy, Darwinist daughter would say, it's just the way we've evolved. Some bits good, some bad, some now unessecary. Like our hips are now mostly to small to get our Larger Babies through. In the Stone -age our Babies wouldn't have weighed more than 5lbs! But, we wouldn't have lived beyond 35 then. 8% is still a lot of People. Especially, now we're all donating our bits. Try to think positive, I know, it must be hard. My best thoughts are with you.
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