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动物在生存和繁殖中,除了必须适应周围的环境以外,还得和其他个体相互竞争。动物与环境之间,有矛盾,也有斗争。在漫长的进化中,矛盾也在不断变化和发展。动物只有通过
In their survival and reproduction, animals must compete with other individuals in addition to their surroundings. There are contradictions and struggles between animals and the environment. In the long evolution, the contradictions are constantly changing and developing. Animals only pass