Which Feature Is Characteristic of Birds' but Not Placental Mammals

question 1

Multiple Choice

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.

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