Metamerism is a characteristic feature of .........

Choose the correct option.

Identify the correct terms for the following analogy-based questions:
$(i)$ Porifera : Choanocytes :: Platyhelminthes : ....
$(ii)$ Chondrichthyes : Placoid scales :: Osteichthyes : ....

Which of the following is correctly matched?

$A$: Annelids,arthropods,and molluscs are protostomial coelomates.
$R$: All three phyla include members with bilateral symmetry and a true coelom.

Match the following group of organisms with their respective distinctive characteristics and select the correct option:

Organisms	Characteristics
$(a)$ Platyhelminthes	$(i)$ Cylindrical body with no segmentation
$(b)$ Echinoderms	$(ii)$ Warm-blooded animals with direct development
$(c)$ Hemichordates	$(iii)$ Bilateral symmetry with incomplete digestive system
$(d)$ Aves	$(iv)$ Radial symmetry with indirect development