Crocodile and penguin are similar to whale and
dogfish in which one of the following features?
(a) Possess a solid single stranded central nervous
system
(b) Lay eggs and guard them till they hatch
(c) Possess bony skeleton
(d) Have gill slits at some stage
dogfish in which one of the following features?
(a) Possess a solid single stranded central nervous
system
(b) Lay eggs and guard them till they hatch
(c) Possess bony skeleton
(d) Have gill slits at some stage