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为什么北极熊的毛发是白色的？
北极熊的毛发呈现白色，主要基于以下几个原因：
1、光学特性：北极熊的毛发实际上是透明的，其内部呈中空管状结构。当阳光照射到毛发上时，光线在管状结构中发生散射和折射，最终呈现出白色外观。
2、伪装功能：北极熊生活在冰雪覆盖的环境中，白色的毛发能够帮助它们与周围环境融为一体，从而避免天敌的发现并提高捕猎效率。
3、保温功能：毛发中空的结构不仅使北极熊看起来是白色的，还能有效减少热量流失。阳光通过毛发直接照射到皮肤上，帮助北极熊在寒冷环境中保持体温。
总结：北极熊的毛发呈现白色，主要归因于其毛发的光学特性、伪装功能以及保温功能。这些特性是北极熊长期适应极地环境的结果，对其生存具有重要意义。
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