自然界中的生物在繁殖过程中一定会表现出变异的特性而且变异是 的生物的变异为生物进化提供了原始的材料没有 就没有生物的进化.生物要生存 Template




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tomski自然界中的生物在繁殖过程中一定会表现出变异的特性而且变异是 的生物的变异为生物进化提供了原始的材料没有 就没有生物的进化.生物要生存 coloring