Organ transplants are sometimes heterotopic (donated organ added next to host’s organ) instead of orthotopic (donated organ replaces host’s organ), which is how some people end up with two hearts or two livers. Though the estimation of averages can be tricky: an individual’s liver count may arguably be a fraction instead of a whole number, and the heart average is counterbalanced by people who live with artificial heart prosthetics and so, arguably, have 0 hearts.
Mammary lines run all the way down to the feet. Don’t ask me how I know.
How do…never mind.
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