Extinction is a process that can depend on a variety of ecological, geographical, and physiological variables.These variables affect different species of organisms in different ways, and should, therefore, yield a random pattern of extinctions.However, the fossil record shows that extinction occurs in a surprisingly definite pattern, with many species vanishing at the same time.
Which of the following, if true, forms the best basis for at least a partial explanation of the patterned extinctions revealed by the fossil record?
Major episodes of extinction can result from widespread environmental disturbances that affect numerous different species.
Certain extinction episodes selectively affect organisms with particular sets of characteristics unique to their species.
Some species become extinct because of accumulated gradual changes in their local environments.
In geologically recent times, for which there is no fossil record.human intervention has changed the pattern of extinctions.
Species that are widely dispersed are the least likely to become extinct.
除了以上的variables,可能有其他的factor能统一影响所有动物,就是A所说的disturbance
好吧 居然做对了
答案是a吗?我按了显示答案,但是没有显示出来
是A~为啥显示不出来呢?你用的是手机还是电脑打开的?
手机app看的
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