In the late 1800s, a biologist studying animal embryos coined the phrase "ontogeny recapitulates phylogeny," meaning that the physical development of an animal embryo (ontogeny) seemed to retrace the changing form of the species during its evolutionary history (phylogeny). why would embryonic development retrace evolutionary steps?
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In the late 1800s, a biologist studying animal embryos coined the phrase "ontogeny recapitulates phy...
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