Blastopore -

: It marks the spot where cells move inward to form the primitive gut, known as the archenteron .

: Biologists use the fate of the blastopore to divide the animal kingdom into two massive groups: blastopore

: In amphibians, the "lip" of the blastopore acts as a primary signaling center that tells surrounding cells whether to become a head, a tail, or a nervous system. How It Forms Blastopore - an overview | ScienceDirect Topics : It marks the spot where cells move

: The blastopore becomes the mouth (e.g., insects, mollusks). blastopore