Why are we born with 2 kidneys if we only technically need one to survive?
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Kidneys are easily damaged organs due to their location in the back therefore natural selection favored populations with two kidneys instead of one. This is actually a common thing in anatomy for example humans have two eyes despite needing only one for sight, two lungs despite still being able to breathe with one, two testes, two ovaries, two halves of the brain etc.
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