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OpenStudy (anonymous):
11. Four of the five answers below are principal characteristics of all chordates. Select the exception. a. post-anal tail c. notochord e. pharyngeal gill slits b. bony vertebra d. dorsal nerve cord
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OpenStudy (blues):
B. Point to a counter example - sharks, skates and rays are certainly chordates but they don't have bony vertebra. In fact, they don't have bones at all.
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