問題詳情

13. Which of the following is NOT a defining trait of the phylum Chordata?
(A) notochord
(B) dorsal hollow nerve cord
(C) pharyngeal slits
(D) post anal tail
(E) protostome development

參考答案

答案:E
難度:適中0.615385
統計:A(2),B(2),C(0),D(0),E(8)