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Q.
With respect to their classification, find the odd one out from the following.
NTA AbhyasNTA Abhyas 2020Animal Kingdom
Solution:
Echinus (sea urchin), Antedon (sea lily), Cucumaria (sea cucumber) belong to phylum Echinodermata. They are all marine with radial symmetry and have an endoskeleton of calcareous ossicles. Aplysia (sea hare) is a mollusc.