Which of the following embryonic developmental stages is most similar across all three groups?
A) Stage 1
B) Stage 2
C) Stage 3
D) Stage 4

Question

Which of the following embryonic developmental stages is most similar across all three groups? 
A) Stage 1 
B) Stage 2 
C) Stage 3 
D) Stage 4

Quizplus · Accepted Answer

Stage 2, which is the stage where the embryo develops into a three-layered structure (ectoderm, mesoderm, and endoderm) is most similar across all three groups (mammals, birds, and reptiles). At this stage, the basic body plan of each group is established, and they share many common developmental features.

Which of the Following Embryonic Developmental Stages Is Most Similar