Match the following and select the correct option:

Animal	Characteristics
$(a)$ Pila	$(1)$ Jointed appendages
$(b)$ Cockroach	$(2)$ Perching
$(c)$ Asterias	$(3)$ Water vascular system
$(d)$ Torpedo	$(4)$ Electric organ
$(e)$ Parrot	$(5)$ Presence of shell
$(f)$ Dog fish	$(6)$ Placoid scales

(A-5, B-1, C-3, D-4, E-2, F-6) The correct matches are as follows:
$(a)$ Pila belongs to the phylum Mollusca and is characterized by the $(5)$ Presence of shell.
$(b)$ Cockroach belongs to the phylum Arthropoda and is characterized by $(1)$ Jointed appendages.
$(c)$ Asterias (Starfish) belongs to the phylum Echinodermata and is characterized by the $(3)$ Water vascular system.
$(d)$ Torpedo is a cartilaginous fish that possesses a $(4)$ Electric organ.
$(e)$ Parrot is a bird (Aves) characterized by $(2)$ Perching behavior.
$(f)$ Dog fish (Scoliodon) is a cartilaginous fish characterized by the presence of $(6)$ Placoid scales.
Therefore,the correct sequence is: $(a-5, b-1, c-3, d-4, e-2, f-6)$.