Differentiate between Chondrichthyes and Osteichthyes.

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

Which of the following statements are true/false?
$(i)$ In $Torpedo$,the electric organs are capable of generating strong electric shock to paralyze the prey.
$(ii)$ Bony fishes use pectoral,pelvic,dorsal,anal,and caudal fins in swimming.
$(iii)$ Amphibian skin is moist and has thick scales.
$(iv)$ Birds are poikilothermic animals.
$(v)$ The most unique mammalian characteristic is the presence of milk-producing mammary glands by which the young ones are nourished.

Which of the following organisms possess a four-chambered heart?

Which of the following is properly matched?

Which of the following organisms possess an open-type circulatory system?