問題詳情
74. While sampling marine plankton in a lab, a student encounters large numbers of fertilized eggs. The student rears some ofthe eggs in the laboratory for further study and finds that the blastopore becomes the mouth. The embryo develops into atrochophore larva and eventually has a true coelom. These eggs probably belonged to a(n) ____.
(A) arthropod
(B) nematode
(C) echinoderm
(D) mollusk
(E) chordate
參考答案
答案：D
難度：困難0.333333
統計：A(1),B(0),C(0),D(1),E(0)