The four defining characteristics of chordates are
A. pharyngeal pouches, a dorsal nerve cord, a notochord, and a postanal tail.
B. bilateral symmetry, segmentation, a well-developed coelom, and limbs.
C. a dorsal hollow nerve cord, a notochord, bilateral symmetry, and mammary glands.
D. a well-developed coelom, pharyngeal pouches, a notochord, and jaws.
E. segmentation, a dorsal hollow nerve cord, pharyngeal pouches, and an amniotic egg.
Answer: A
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