Four of the five answers below are principal characteristics of all chordates. Select the exception. a. post-anal tail b. bony vertebra c. notochord d. dorsal nerve cord e. pharyngeal gill slits

Four of the five answers below are principal characteristics of all chordates. Select the exception.

a.    post-anal tail

b.    bony vertebra

c.    notochord

d.    dorsal nerve cord

e.    pharyngeal gill slits

Ans: b(  bony vertebra)