Multiple Choice
Refer to the figure showing a 9-day chick embryo. 
Based on the figure, which statement is true?
A) The structure at point 6 is the last extraembryonic membrane to form.
B) The structure at point 7 includes contributions from ectoderm and mesoderm.
C) The structure at point 6 functions in gas exchange.
D) The structure at point 3 includes contributions from endoderm and mesoderm.
E) Blood vessels line the outer surface of the structure at point 6.
Correct Answer:
Verified
Correct Answer:
Verified
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