The fossil record shows that many species have endured for millions of years—so why shouldn't we?
化石记录显示，已经有许多物种存活了数百万年——那么我们为什么不能呢？
That could explain why parthenogenesis reproduction has emerged in so many species.
这就可以解释为什么这么多物种都会有孤雌生殖现象。
Why they should do so is not immediately obvious. But the same is true in many other species.
在其他很多物种中亦是如此。
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