To solve this problem, we need to match the organisms with their respective characteristics. Let's analyze each organism:$\newline \bullet$(a) Pila:$\newline$ - Pila is a genus of freshwater snails, which are mollusks.$\newline$ - They possess a radula, which is a tongue-like organ with chitinous teeth used for feeding.$\newline$ - Therefore, Pila matches with (iii) Radula.$\newline \bullet$(b) Bombyx:$\newline$