Find the odd one out. Give reasons:
sea urchin, starfish, brittle star, jellyfish
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jellyfish
Reason — Jellyfish is a cnidarian but others are echinoderms.
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snake, alligator, eel, turtle
frog, shark, seahorse, carp
snail, oyster, earthworm, octopus
jellyfish, Hydra, sea anemone, butterfly