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Ctenophores, or comb jellies, are characterized by the presence of eight comb plates that aid in locomotion.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Ctenophora and Platyhelminthes
Ctenophores have comb plates, rows of cilia used for locomotion (NCERT, Chapter 4, page 50). Nerve nets are in cnidarians, water canal systems in poriferans, and segmentation in annelids.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Porifera and Cnidaria
Platyhelminthes are triploblastic and acoelomate, meaning they lack a true body cavity.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Basis of Classification - Symmetry Coelom Segmentation
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