問題詳情
【題組】68. Why can only a small number of extinct animals be cloned?
(A) There are too many substitute mothers.
(B) Damaged DNA must be collected and preserved.
(C) There is no a scientific limit to mass production.
(D) The time is insufficient, and so are the resources.
參考答案
答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)