Gill clefts and notochord appear in the embry | vedclass

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(A) The presence of gill clefts and a notochord during the embryonic development of all vertebrates,from fishes to mammals,provides evidence for the t

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Recapitulation

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(A) The presence of gill clefts and a notochord during the embryonic development of all vertebrates,from fishes to mammals,provides evidence for the theory of Recapitulation (also known as the Biogenetic Law).This theory,proposed by Ernst Haeckel,states that 'Ontogeny repeats or recapitulates phylogeny',meaning that an organism's development (ontogeny) reflects the evolutionary history (phylogeny) of its ancestors.

Gill clefts and notochord appear in the embryonic development of all vertebrates from fishes to mammals. This supports the theory of

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