問題詳情
【題組】31. What is the reason behind the poor ossification of the bones of fish native to theMariana Trench?
(A) There is not sufficient sunlight in the trench to allow for ossification.
(B) They don’t have to have well ossified bones because there are few predatorsin the Mariana Trench.
(C) The fish in the trench must be able to survive on fewer nutrients.
(D) The pressure from the deep depth of the trench makes proper ossificationimpossible.
參考答案
答案：D
難度：簡單0.7
書單：沒有書單，新增