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

Question

Crocodile and penguin are similar to whale and dog fish 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

Tardigrade Admin · Accepted Answer

Animals belonging to phylum chordata are fundamentally characterised by the presence of a notochord, a dorsal hollow nerve cord and paired pharyngeal gill slits. Crocodile, penguin, whale and dogfish are all chordates. All of them have gill slits or have had it during embryonic development. Thus, paired gill slits are present in these animal at some stage of life.

Q. Crocodile and penguin are similar to whale and dog fish in which one of the following features?

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