音标:[pæn'spə:miə] ;
n. 有生源说(等于panspermatism,panspermy);胚种论

The Murchison meteorite was found to be 4.5 billion years old, 人们发现,默奇森陨石的年代已达45亿年, and it was studded with amino acidsseventy-four types in all, eight of which are involved in the formation of earthly proteins. 上面

发表于:2019-02-17 / 阅读(115) / 评论(0) 分类 万物简史