【简答题】生态灭绝

【简答题】  1.1 Fill in the blanks with words or phrases from the box below. Change the form where necessary. border doom creative distinguish essence host initial neighborhood obvious recall routine swing th...

【单选题】下列蕨类植物中，已经灭绝的是?

【单选题】旅鸽灭绝的原因是( )。

【简答题】简述灭绝的生物学意义。

【简答题】野外灭绝

【单选题】天花的灭绝是科学的力量吗：

【单选题】Many people feel that human beings are responsible for the disappearance of some other animal species. While we may have hastened the disappearance of some, abundant evidence suggests mankind has had ...

【判断题】软舌螺类目前还未灭绝。( )

【单选题】扇鳍鱼类是在什么时候灭绝的？（）