Question Detail
Question
During which developmental process are the three primary germ layers—ectoderm, mesoderm, and endoderm—formed?
Correct Answer
Option A is the correct answer.
Detailed Explanation
Gastrulation is the critical embryonic stage where the blastula is reorganized into a multilayered structure. Choice B is incorrect because organogenesis happens after these layers are already established.
Hint
This stage creates the 'building blocks' for the body.