In which of the following is ecdysis (moulting) $NOT$ observed?

Flame cells and nephridia are found in $ \text{Platyhelminthes} $ and $ \text{Annelida} $ respectively.

Choose the correct option for the following statements:
$(i)$ Metamerism is a characteristic feature of $Annelida$ / $Arthropoda$.
$(ii)$ Internal buds in sponges are called $Gemmules$ / $Gemmi$.

Identify the mismatched pair.

$A$ list of animals is given below. Identify the animals with an open circulatory system and choose the correct answer.
$(A)$ Ascidia $(B)$ Cockroach
$(C)$ Earthworm $(D)$ Prawn
$(E)$ Silverfish $(F)$ Snail
$(G)$ Squid

Identify the location and function of the following structures:
$(i)$ Comb plates
$(ii)$ Flame cells