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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