Which of the following is common to the development of both birds and mammals?
A) holoblastic cleavage
B) epiblast and hypoblast
C) trophoblast
D) grey crescent

Question

Quizplus · Accepted Answer

Both birds and mammals undergo gastrulation, during which embryonic cells differentiate into the epiblast (which gives rise to the embryo proper) and the hypoblast (which forms the yolk sac). This is not true of A, C, or D.

Which of the Following Is Common to the Development of Both