远古时候的东西不是因含氧量过高而使体型过大吗，但为什么还会出现像鼠龙这种身型只有几十厘米的？ 怎样系统学习古生物学
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2.\u5316\u77f3\u91c7\u96c6\u65b9\u6cd5
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3.\u5316\u77f3\u91c7\u96c6\u7684\u7cbe\u5ea6
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鼠龙是恐龙的一种，生活于侏罗纪早期。侏罗纪距今约1亿9000万年前，与石炭纪的年代相差甚远，所以，鼠龙与“巨虫时代”并无关联。
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