Eli5: if our bodies are able to form entire human beings from scratch, why can’t it grow back organs that have been amputated?
In: Biology
It’s just not in our cells’ instructions. Someone losing their heart and surviving long enough to potentially grow a new one doesn’t happen often enough for the mutation to “stick” and play a role in our evolution.
The salamander being able to regrow certain parts is an example of this as well – A lizard narrowly escaping after getting caught by one of its limbs is more likely to survive and reproduce.
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