通过运用种类繁多的令人印象深刻的照片，作者凯文.库尔茨提出了一系列发人深省的问题来帮助读者们判断事物是生物还是非生物。比方说，如果大多数（但不是全部）生物都能动，那么非生物能动吗？作为《比较与对照手册》系列的一部分，本书为判断某物是生物还是非生物提供了一个独特的视角。
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