The exoskeleton of Arthropoda is covered by ..........

Bilateral symmetry,metameric segmentation,coelom,and open circulatory system are the characteristics of:

Describe the largest phylum of Animalia.

$A$ 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?

Which of the following animals contains $Hemocyanin$ as a respiratory pigment?

To which of the following classes does $Limulus$ belong?