Then, perhaps through a random genetic mutation, one tree, the calvaria, produced fruit with tougher seeds that could survive being eaten by the birds.

 
  • 于是,多半是通過(guò)一種隨機的基因突變,其中一棵樹(shù),大顱欖樹(shù),長(cháng)出了較原來(lái)更為堅硬的,被鳥(niǎo)吞了也能幸存的種子。
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