You may have heard that humans and giraffes have the same number of neck bones. And that's true! But it isn't the whole story. See, all mammal species except for three have exactly seven cervical vertebrae. And the reason for this is long and complicated, and also includes some cancer. So let's get into it!
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Sources: https://docs.google.com/document/u/1/d/e/2PACX-1vQrgHb0eN0xWG7bUDhXqngeBz871WS6ob75-gnDbetlUmmYK-BvqTDFTy0WC0xrwtDKjDJmsW0TQGV2/pub