Cockroach: 3 pairs of legs + 2 pairs of wings. Earthworm: no skeleton, uses muscles and setae (tiny bristles) to grip soil. Snail: uses muscular foot, leaves trail of slime. Fish: S-shaped body movement, pectoral and tail fins for steering. Birds: hollow bones (light), powerful chest muscles for wing flapping. Snake: S-shaped movement using ribs and muscles.
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