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Answer: 3. Parapodia

Key idea: Arthropods have a chitinous exoskeleton, a metamerically segmented body and jointed appendages.

Parapodia are paddle-like lateral outgrowths of polychaete annelids such as Nereis, used in swimming. Arthropods do not have them, so the answer is (3).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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