The process of how an embryo develops and forms from a single cell into a complex organism.
From Greek embryon (embryo) plus genesis (origin, creation). The term became standard in 19th-century developmental biology to describe the full process of fetal development.
Embryogenesis is genuinely miraculous—a single fertilized egg reorganizes itself into thousands of specialized cell types through processes we're still discovering. It's the ultimate biological origami.
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