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Molluscs have a body covered by a calcareous shell and a mantle that secretes the shell.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Hemichordata and Chordata - Protochordata
Annelids show true segmentation (metamerism), where the body is divided into repetitive segments.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Aschelminthes and Annelida
Ctenophores, also known as comb jellies, use comb plates for locomotion.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Ctenophora and Platyhelminthes
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