Which is not an aquatic animal?
(a) Hydra
(b) Jelly fish
(c) Corals
(d) Filaria
Hydra, jellyfish, cand orals are aquatic animals that live in water. Thus, they are called aquatic animals. Roundworm is a nematode parasite found in both aquatic as well as terrestrial animals.
Filaria is a disease caused by Wuchereria and transmitted to humans through mosquitoes.
The correct answer is d)- Filaria.