Which Statement About Chick Development Is True

Multiple Choice

Which statement about chick development is true?

A) Cells migrate through the primitive groove into the blastocoel to become endoderm and mesoderm.
B) Chick embryos lack a blastocoel.
C) Hensen's node is located at the posterior end of the primitive groove.
D) Gastrulation begins as cells in the anterior region of the epiblast move toward the midline.
E) Cells generated in Hensen's node produce the vertebral column, which organizes the embryo along an axis.