Question Detail
Question
In embryo development, which process establishes the three germ layers?
Correct Answer
Option B is the correct answer.
Detailed Explanation
Gastrulation is the dramatic series of cell movements that transforms a hollow blastula into a multi-layered embryo (gastrula) with ectoderm, mesoderm, and endoderm.
Hint
It's a fundamental, transformative stage after the blastula.