Sixty-five million years ago, according to some scientists, an asteroid bigger than Mount Everest slammed into North America, which, causing plant and animal extinctions, marks the end of the geologic era known as the Cretaceous Period.
-
Awhich, causing plant and animal extinctions, marks
分析该选项
-
Bwhich caused the plant and animal extinctions marking
分析该选项
-
Cand causing plant and animal extinctions that mark
分析该选项
-
Dan event that caused plant and animal extinctions, which marks
分析该选项
-
Ean event that caused the plant and animal extinctions that mark
分析该选项