試題詳解

32. All chordates, at some point during their life cycle, are characterized by which of the following derived traits?
(A) Notochord, dorsal hollow nerve cord, pharyngeal slits or clefts, and muscular post-anal tail.
(B) Jaws, mineralized skeleton, lungs, and four limbs.
(C) Vertebrae, cranium, a two-chambered heart, and paired fins.
(D) Hair, mammary glands, endothermy, and a highly developed brain.