Why do people’s vein patterns look different?
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Same reason their freckles are going to be different. Or their hairs all fall in a slightly different place. Or they’ve got slightly different shaped finger nails and everyone has a unique fingerprint.
Your body is created via a set of instructions dictated by your DNA and your DNA is a unique combination that has never been seen on this planet before and will never been seen again. This why there are tiny differences between every single person alive.
EDIT: Should have added that environmental factors can also play a role in the expression and “aging” or certain genes. And no two people are going to have the exact same environment. If you look through it with a fine tooth comb, you will find differences and these can influence physical characteristics as well, not just your personality.
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