Which of the following animal groups exhibits radial symmetry?

Aristotle's lantern is found in .........

The larval stage in Asterias is:
$(a)$ Absent
$(b)$ Free-swimming
$(c)$ Bilaterally symmetrical
$(d)$ Radially symmetrical

Which of the following terms is not applicable to $Echinodermata$?

Which of the following phyla consists exclusively of marine animals?

Water vascular system is the characteristic of which group of the following:
$(a)$ Porifera $(b)$ Ctenophora $(c)$ Echinodermata $(d)$ Chordata