Which of the following is common to the development of birds and mammals?
A) the formation of an embryonic epiblast and hypoblast
B) the formation of an embryonic trophoblast
C) the formation of an embryonic yolk plug
D) the formation of an embryonic grey crescent

Question

Quizplus · Accepted Answer

Both birds and mammals undergo the process of gastrulation, during which an embryonic epiblast and hypoblast form. This is a key developmental stage where the three germ layers (ectoderm, mesoderm, and endoderm) are established. The other options are not common to the development of both birds and mammals.

Which of the Following Is Common to the Development of Birds