(a) Pila is a Mollusc. The mouth contains a file - like rasping organ for feeding called radula. (b) Bombyx is an Arthropod. In Bombyx excretion takes place through malpighan tubules. (c) Pleurobrachia is Ctenophore. The body bears eight external rows of ciliated comb plates, which help in locomotion. (d) Taenia is a platyhelminth specialised cells called flame cells helps in osmoregulation and excretion