fertilised egg splits in two during the early
stages of development, and as a result, the
siblings share exactly the same genetic
information. But our bodies are shaped not
only by our genes, but also by our environment,
and although the twins share the same womb,
their environments are subtly different. Each
twin is in a different position, and experience
slight variations in contact with amniotic
fluid. One might have a longer umbilical
cord than the other, and one might receive
more oxygen or nutrients. Fingerprints
develop during the second trimester, and
these small differences add up to produce
noticeably different fingerprints.
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