Which of the following groups of animals is exclusively marine?
All echinoderms, such as starfish and sea urchins, are exclusively marine animals.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Aschelminthes and Annelida
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Which phylum does the animal 'Pleurobrachia' belong to?
Pleurobrachia is a ctenophore, characterized by the presence of comb plates used for locomotion.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Ctenophora and Platyhelminthes
