Species that were once sparse started to carpet the plots. 曾經(jīng)稀少的物種開(kāi)始遍布草原。
In theory, any species with a very small population could accumulate deleterious mutations faster than it can eliminate them. 理論上，任何數量稀少的物種積累有害變異的速度都超過(guò)了它們消滅這些變異的速度。
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