NEET Biology question

Crocodile and penguin are similar to whale and dogfish in which one of the following features?

(A)Possess a solid single stranded nerve cord
(B)Lay eggs and guard them till they hatch
(C)Possess bony skeleton
(D)Have gill slits at some stageCorrect

Answer: (D)

Solution

All four — crocodile, penguin, whale and dogfish — are chordates and possess pharyngeal gill slits at some stage of development, even though only the dogfish retains functional adult

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Question ID VK-106781