問題詳情
17. Keystone species are those species__________.
(A) that live primarily on or under rocks and stones
(B) whose absence would cause major disruption in an ecosystem
(C) with the largest number of individuals in an ecosystem
(D) that have provided key foods in an ecosystem
(E) that none of the above applies to
參考答案
答案：[無官方正解]
難度：計算中-1
書單：沒有書單，新增