In the embryonic development of chordates,the | vedclass

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(A) In the development of chordate embryos,the egg is typically telolecithal or mesolecithal. The animal pole,which contains the nucleus and less yolk

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Dorsal side

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(A) In the development of chordate embryos,the egg is typically telolecithal or mesolecithal. The animal pole,which contains the nucleus and less yolk,is metabolically more active. During gastrulation and subsequent morphogenesis,the animal pole region primarily gives rise to the ectoderm,which eventually forms the dorsal structures of the adult,including the nervous system and the dorsal body wall.

In the embryonic development of chordates,the animal pole forms which of the following in the adult?

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