Why is the human body so crap?

The human body is too fragile. Some of Us are born with medical conditions, some prevent us from living a normal or good life.

I personally wish we could infuse animal dna into us to help us. Like salamanders/axolotl Aka Polyphyodonts to regenerate limbs and Sharks and similar to regenerate teeth. Because you can’t live without em!! And they don’t regenerate!!
Why is the human body so crap?
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