問題詳情

31. What marine organism is responsible for the thick chalk deposits of the Cretaceous?
(A) Coccoliths
(B)Foraminifera
(C) Radiolaria
(D) Sponges
(E) Diatoms

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