A) arborial insects
B) marine animals
C) terrestrial insects
D) freshwater forms
Correct Answer: B
Solution :
Echinoderms are marine, spiny skinned animals. All members of phylum- Echinodermata are marine. These have water vascular system which helps in locomotion, .e.g., starfish, Antedon. Arboreal insect are insects, which living on trees. Freshwater forms are animals or plants living in freshwater of ponds, .e.g., Hydrilla.
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