Short Answer
Refer to the figure showing two scanning electron micrographs of a chick embryo.Part A of the figure shows the embryo in cross section, and part B shows the embryo as you look down from above, with the overlying epidermal ectoderm removed. 
In comparing these images, we can see that the structures labeled "a" and "b" in part B correspond to the structures labeled _______ in part A, respectively.
Correct Answer:
Verified
Correct Answer:
Verified
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