21. Select all accurate statements
A. All chordates have pharyngeal slits or clefts that function in swimming.
B. All chordates will have a muscular post-an*l tail as adults
C. All chordates will have a notochord during a stage in embryonic development
D. All chordates are bilaterally symmetrical animals that have a vertebral column
E. All chordates have a ventral, hollow nerve cord