In the embryos of all vertebrates,including h | vedclass

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(A) The observation that embryos of all vertebrates possess vestigial gill slits was used by $Ernst \ Haeckel$ to propose his 'Biogenetic Law' or 'Rec

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Karl Ernst von Baer

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(A) The observation that embryos of all vertebrates possess vestigial gill slits was used by $Ernst \ Haeckel$ to propose his 'Biogenetic Law' or 'Recapitulation Theory' $(Ontogeny \ repeats \ Phylogeny)$.However,this idea was challenged by $Karl \ Ernst \ von \ Baer$. He noted that embryos do not pass through the adult stages of other animals; rather,they share common embryonic features that diverge as development progresses.

In the embryos of all vertebrates,including humans,a row of vestigial gill slits appears behind the head,but they function only in fish and not in other adult vertebrates. This observation was challenged by which scientist?

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