Find the odd one out. Give reasons:
jellyfish, Hydra, sea anemone, butterfly
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butterfly
Reason — Butterfly is an arthropod (insect) while others are cnidarians.
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sea urchin, starfish, brittle star, jellyfish
snail, oyster, earthworm, octopus
What are invertebrates?
What do you mean by radially symmetrical body?