Crocodile, penguin, whale and dogfish, all are chordates. So, all of these have gill slits at some stage of development.
NEET UG 2010 — Zoology Evolution
Crocodile and penguin are similar to whale and dogfish in which one of the following features?
Held on 30 Apr 2010 · Verified 9 Jul 2026.
possess a solid single-stranded central nervous system
lay eggs and guard them till they hatch
possess bony skeleton
have gill slits at some stage
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