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

Question

Quizplus · Accepted Answer

Formation of the mouth occurs after the other events listed, as it is a later developmental process following the initial stages of gastrulation, such as invagination, changes in cell shape, and archenteron formation.

Which of These Gastrulation Events Occurs After the Others in Sea