Multiple Choice
Which of these gastrulation events occurs after the others in sea urchins?
A) Changes in the shape of individual blastomeres in the vegetal hemisphere
B) Elongation of the archenteron when filopodia of secondary mesenchyme cells contract
C) Invagination
D) Formation of the archenteron
E) Formation of the mouth
Correct Answer:
Verified
Correct Answer:
Verified
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