The science that studies how living organisms develop from a fertilized egg through all the stages until birth or hatching.
From Greek embryon 'unborn creature' (from en- 'in' + bryein 'to swell') and -logia 'study of.' The field formalized in the 1800s with improved microscopy.
Embryology is one of the best windows into evolution—the fact that human embryos develop gill slits (now ear bones) shows we inherited 400-million-year-old fish blueprints.
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