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Human and dolphin embryos are similar in early stages because both species share a common evolutionary ancestor as vertebrates. During early embryonic development, they exhibit structures such as pharyngeal (gill) slits, tails, and a basic vertebrate body plan. These similarities reflect homologous developmental pathways inherited from a distant common ancestor. Over time, as development progresses, these features are modified or regress according to each species’ specific evolutionary adaptations — for example, humans lose their tails and gill structures, while dolphins adapt to an aquatic lifestyle. This phenomenon is known as embryonic homology and provides strong evidence for evolutionary relationships among vertebrates.

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