Diploblastic animals have two embryonic germ layers — ectoderm and:
- Mesoderm
- Endoderm (with undifferentiated mesoglea in between)
- Notochord
- Spongocoel
Show answer and 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).