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(A) Ernst Haeckel proposed the theory of recapitulation,also known as the biogenetic law. He observed that embryos of all vertebrates,including humans

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Embryonic

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(A) Ernst Haeckel proposed the theory of recapitulation,also known as the biogenetic law. He observed that embryos of all vertebrates,including humans,show certain common features during the early stages of development,such as gill slits,which are not found in the adult stages of many of these organisms. These embryonic similarities suggest a common evolutionary ancestry among vertebrates. Therefore,the correct stage is the embryonic stage.

Based on Haeckel's observations,during which stage are certain features common to all vertebrates?

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