I am not sure about this. I have never heard of it happening. Some people are born as siamese twins who share organs and have to be separated when they are young but I have never heard of anyone being born with 2 of something!
Yes, it happens all the time. Most people don’t realise it during their lifetime, though, and in most cases it’s not at all harmful. When I was learning anatomy I was quite shocked by how abnormal we often are!
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