Which feature is characteristic of birds' but not placental mammals' embryonic development?
A) The embryo forms from the epiblast.
B) Gastrulation occurs in the epiblast.
C) The hypoblast contributes to extraembryonic membranes.
D) Epiblast cells migrate through the primitive groove to become endoderm and mesoderm.
E) The blastocoel lies between the epiblast and hypoblast.

Question

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The Answer of Which feature is characteristic of birds' but not placental mammals' embryonic development?
A) The embryo forms from the epiblast.
B) Gastrulation occurs in the epiblast.
C) The hypoblast contributes to extraembryonic membranes.
D) Epiblast cells migrate through the primitive groove to become endoderm and mesoderm.
E) The blastocoel lies between the epiblast and hypoblast.

Which Feature Is Characteristic of Birds' but Not Placental Mammals