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举一反三
【多选题】集合种群所描述的动态、斑块、局域种群等正确的是（）
A.
种群过小会导致近交衰退，即使环境再好也无用
B.
集合种群动态：指人为干扰使生物的栖息地片段化，斑块生境下的种群变化
C.
集合种群的空间尺度：一个物种所占据的整个地理区域，一般个体不会扩散出该区域
D.
在刚刚破碎化的栖息地中生存的种通常不具备一个集合种群的功能，因为这时个体也许只有很弱的迁移能力，因而这样的种很易灭绝
【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 ...
A.
Human beings have hastened the disappearance of some.
B.
There was mass extinction long before humanity's time on Earth.
C.
Human beings'activities have had great impact on the earth.
D.
Many species have extinct since the human race came into being.