Which one of the following pairs of animals are similar to each other pertaining to the feature stated against them?

Identify the correct terms for the following analogy-based questions:
$(i)$ Aquatic Annelids : Parapodia :: Arthropods : ....
$(ii)$ Annelids : Nephridia :: Arthropods : ....

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.

Identify the mismatched pair from the following:

Radial symmetry is not found in

Select the correct option for the circulatory system.