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地球，自40亿年前，就出现了最低等的菌类，直至今日活跃的动物近150多万种。这些动物在美丽的星球上经历过无数次的变迁，终于战胜了自然的种种严峻考验，使赤道两极、雪山到谷地、大陆到海域无不遍布着自己的足迹。它们有的遨游于海底、有的奔跑于大地、有的翱翔于天际，一起共同演绎着世界的多姿多彩与盎然生机。
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