What are the four extraembryonic membranes found only in amniotes?
Amnion, Yolk sac, Allantois, and Chorion
Amnion, Chorion, Blastocyst, and Trophoblast
Chorion, Yolk sac, Neural crest cells, and Somites
Blastocyst, Amniotic cavity, Placenta, and Allantois
The four extraembryonic membranes found only in amniotes are the amnion, yolk sac, allantois, and chorion.
Option a is the correct answer.