Aquatic arthropods belonging to this class breathe through gills.
Correct answer: C. Crustaceans
- A. Insects
- B. Arachnids
- C. Crustaceans
- D. Arachnids and Crustaceans
Explanation
'Aquatic arthropods' (crustaceans and the chelicerate horseshoe crabs) possess gills for respiration. Although they vary in structure and location, the gills are always outgrowths of the integument (skin) and are therefore covered by the exoskeleton, which is thin in this area and not a barrier to the exchange of gases.
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