3 is a very specific number, it is not a random number. These genes are completely nonfunctional in placental mammals, so if there are 3 or 2 or 5 or 100, it makes no difference to the function of the mammal - at all. So why 3 specifically? Why do all mammals have 3 VIT genes and not a single one more and not a single one less?
Evolution has answers for all of these questions and your friends have no answers - they can only make excuses like - its magic, its a coincidence. This is the same thing as saying it is a coincidence that you have 2 legs and your parents have 2 legs. Is that really a coincidence?
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