extinction potential [电] 熄灭电位
- This potential sixth great extinction is unique in that it is caused largely by the activities of a single species.
这潜在的第六次物种大灭绝独特之处在于,它主要是由单一一个物种的活动造成的。 - For the two other largest extinctions— one about440 million years ago and the other about365 million years ago— iridium, shocked quartz, microspherules, potential craters and productivity collapse have been reported, but the c
至于另外两次大灭绝,分别发生在4亿4000万年前,与3亿6500万年前,铱含量异常、形石英、球、能的撞击坑、物生产力崩溃等证据,都有人报导过,但是陨石撞击与生物大灭绝之间的因果关连,仍待建立。
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