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本书主要介绍了出于生存需要,动物会对环境产生适应性变化。而对于危险和天敌,动物有各种各样的防御措施,有伪装、拟态、冬眠等方式。本书同时还介绍了华莱士的适者生存的自然选择理论,并通过列举了一些濒危动物...
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