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同样都是恐龙称霸,侏罗纪和白垩纪环境有什么区别?
侏罗纪和白垩纪都是中生代的关键时期。侏罗纪开始于2亿130万年前 ... 与此同时,翼龙在天空中称霸,而哺乳动物的祖先则局限于夜间活动。 进入白垩纪,地球大陆逐渐呈现出现今的地貌和位移。海洋更加深入陆地,导致降雨增多,气温逐渐降低。
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Makary to lead FDA
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Emperor penguin released
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Plead guilty to corpse abuse
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Found liable in NY suit
Recall over 208,000 EVs
To lead Treasury Department
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Bird flu detected in CA child
NYC congestion plan OK'd
Dave Weldon to lead CDC
Special vote to fill vacancy
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