Which group of organisms supplies the best evidence that elaborate parapodia are most suitable for respiration in a marine environment?

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Polychaetes are known for their elaborate parapodia, which are used not only for locomotion but also for respiration in a marine environment. Other annelids, such as oligochaetes and leeches, have simpler bodies and do not rely on parapodia for respiration. Nematodes are not annelids and do not have parapodia.

Which Group of Organisms Supplies the Best Evidence That Elaborate