During gastrulation,the dorsal lip of the bla | vedclass

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(D) During the process of gastrulation in amphibian embryos,the first external sign is the formation of the dorsal lip of the blastopore. This structu

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Behind the grey crescent area

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(D) During the process of gastrulation in amphibian embryos,the first external sign is the formation of the dorsal lip of the blastopore. This structure appears at the site of the grey crescent,specifically just behind the grey crescent area,marking the beginning of involution where cells begin to migrate into the interior of the embryo.

During gastrulation,the dorsal lip of the blastopore (the first external sign of gastrulation) appears:

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