Which one respires through gills?
Prawn is an aquatic arthropod, it respires through gills. Their gills are complex outgrowth that holds blood vessels for the exchange of gases. A whale is an aquatic mammal, Frog is an amphibian and Crocodile is a reptile. All of these animals belong to phylum Chordata and breathe through lungs.
So, the correct answer is option D.