Which of the following organisms possess a two-chambered heart?

Read the following statements.
$(a)$ Metagenesis is observed in Helminths.
$(b)$ Echinoderms are triploblastic and coelomate animals.
$(c)$ Round worms have organ-system level of body organization.
$(d)$ Comb plates present in ctenophores help in digestion.
$(e)$ Water vascular system is characteristic of Echinoderms.
Choose the correct answer from the options given below.

Which of the following is an incorrect pair regarding the classification of organisms?

Match the animals listed under Column-$I$ with their respective zoological names given under Column-$II$; choose the answer that provides the correct combination of the alphabets of the two columns.
Column-$I$ (Common Name) | Column-$II$ (Zoological Name)
$A$. Starfish | $p$. Sepia
$B$. Jellyfish | $q$. Astropecten
$C$. Devilfish | $r$. Aurelia
$D$. Cuttlefish | $s$. Octopus

In which phyla is radial symmetry observed?

Match the following columns and select the correct option.

Column-$I$	Column-$II$
$(a.)$ Sea fan	$(i)$ Mandarina
$(b.)$ Sea hare	$(ii)$ Taenia
$(c.)$ Radial symmetry	$(iii)$ Gorgonia
$(d.)$ Endoparasite	$(iv)$ Aplysia