In the transverse section of the gastrula shown, which germ layer lies between the outer ectoderm and the inner endoderm? 
ABlastocoel
BMesoglea
CMesoderm
DArchenteron
Answer & Solution
Correct answer: C. Mesoderm
In a triploblastic gastrula, the middle germ layer between ectoderm and endoderm is the mesoderm. Blastocoel and archenteron are cavities, while mesoglea is characteristic of diploblastic animals.
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