Crocodile and penguin are similar to whale and dogfish in which one of the following features?
Correct answer: D. Have gill slits at some stage
- 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
Explanation
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 them during embryonic development. Thus, paired gill slits are present in these animals at some stage of life.
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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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