The extinctions differ from species to species, and we don't find any common genetic characteristic to distinguish extinct from surviving species.
各个物种的灭绝原因都不相同,而且找不到任何遗传特性来区别灭绝物种与存活物种。
Extinct but already fully marine cetaceans are known from the fossil record.
从化石记录中可以了解到一些已经灭绝、但已经完全变成海洋生物的鲸目动物。
Archaeological finds of nuts from the extinct Easter Island palm show tiny grooves, made by the teeth of Polynesian rats.
从已灭绝的复活节岛棕榈坚果的考古发现中可以看到由波利尼西亚老鼠的牙齿形成的小凹槽。
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