Anatomy Which of the following is true regarding gastrulation: A Establishes all the three germ layers B Occurs at the caudal end of the embryo prior to its cephalic end. C Involves the hypoblastic cells of inner cell mass D Usually occurs at 4 weeks 💡 Explanation Which of the following is true regarding gastrulation: ✓ Correct Answer: A. Establishes all the three germ layers