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人类为什么曾经拥有尾巴，后来又会失去尾巴？
source link: https://tech.sina.com.cn/d/f/2019-07-29/doc-ihytcitm5346619.shtml
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尾巴几乎是动物界的标配。鱼的尾鳍可以为游泳提供推进力；鳄鱼在尾部储备脂肪；蜥蜴逃生的时候会舍弃尾巴当诱饵；喵星人还可以抓住自己的尾巴转圈玩。从生命发展史来看，生命源于海洋，当鱼类从海中爬上陆地，当然，也把尾巴带了出来，后来，爬行动物又把尾巴
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