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Hydra, a cnidarian, is diploblastic, meaning its body develops from two germ layers: ectoderm and endoderm.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Porifera and Cnidaria
Diploblastic animals (e.g., Cnidaria) have only two germ layers: ectoderm and endoderm. Triploblastic animals (e.g., Platyhelminthes and above) have an additional mesoderm.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Basis of Classification - Symmetry Coelom Segmentation
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