Anopheles eggs float in water due to

Presence of hepatopancreas is a characteristic of

$A$ student has identified a triploblastic,coelomate,segmented animal as an arthropod. Which additional character should the student have verified before identifying that animal as an arthropod?

Most of the aquatic arthropods and molluscs respire through $:-$

$A$ moth is closely related to

The green glands found in some arthropods are involved in...