Based on the internal structure and physiological features described in the sources, the organisms are matched as follows: (a) Pila (Apple snail) belongs to the phylum Mollusca; the sources state that the mouth in this phylum contains a file-like rasping organ for feeding called the radula . (b) Bombyx (Silkworm) belongs to the phylum Arthropoda; the sources specify that in arthropods, excretion takes place through Malpighian tubules . (c) Pleurobrachia belongs to the phylum Ctenophora; the sources describe these organisms as having eight external rows of ciliated comb plates that assist in locomotion . (d) Taenia (Tapeworm) is a member of the phylum Platyhelminthes; the sources explain that these animals possess specialised cells called flame cells that function in osmoregulation and excretion . This results in the matching sequence: (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i).