You believe that an adult animal you are examining is a vertebrate but concede that it may be an invertebrate chordate. Which of the following would ensure that you are indeed looking at a vertebrate?
A) It is able to swim.
B) It lacks a notochord.
C) Its notochord functions as an endoskeleton.
D) It uses its pharyngeal gill slits for respiration.
E) It has a dorsal hollow nerve cord.
Answer: B
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