Which structure in the development of the amphibian is equivalent to the primitive knot in bird development?

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In amphibian development, the dorsal lip of the blastopore is equivalent to the primitive knot in bird development. Both structures are involved in gastrulation and play a role in organizing the embryo's development. The other structures listed (ectoderm, archenteron, endoderm) are not equivalent to the primitive knot.

Which Structure in the Development of the Amphibian Is Equivalent