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Diploblastic animals have two embryonic germ layers — ectoderm and:

AMesoderm
BEndoderm (with undifferentiated mesoglea in between)
CNotochord
DSpongocoel
Answer & Solution
Correct answer: B. Endoderm (with undifferentiated mesoglea in between)
**Diploblastic:** ectoderm + endoderm + mesoglea (undifferentiated layer) between them. Coelenterates are diploblastic. Triploblastic animals add a third true layer — mesoderm — between ectoderm and endoderm (Platyhelminthes onwards).
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