Crocodile and penguin are similar to Whale and Dogfish in which one of the following features? (...

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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
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