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Which of the following are similar in their basic function? 

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Nephridia and parapodia – Excretion
Air bladder and urinary bladder – Excretion
Parapodia and comb plates – Locomotion
Tympanum and operculum – Hearing

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detailed solution

Correct option is C

Parapodia and comb plates are the locomotory structures in annelids and ctenophores respectively.Tympanum helps in hearing while operculum is a lid that covers gills in bony fishes.Air bladder helps in buoyancy while urinary bladder stores urine.Nephridia help in excretion.

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