A characteristic common to all chordates that is lacking in other animal groups is
Correct answer: A. The appearance of pharyngeal gill slits
- A. The appearance of pharyngeal gill slits
- B. The presence of three germ layers
- C. The presence of vertebrae
- D. A true coelom
- E. The embryonic appearance of an archenteron
Explanation
Pharyngeal gill slits appear only in chordates. All eumetazoa possess three germ layers and develop an archenteron. A true coelom is shared with other phyla, such as Echinodermata and Arthropoda. Not all chordates have vertebrae (only the vertebrates do).
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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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