Passage Three [br] What has been regarded as the indicator of potential life on

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问题 Passage Three [br] What has been regarded as the indicator of potential life on other planets?

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答案 Water．

解析文章最后两段都表明，人类从自身的生理机制出发，相信生命之源在于水，科学家之所有到火星上去寻找生命的痕迹，是因为他们在火星表面发现了水的痕迹，可见，一直以来，“水”就是生命存在的指标。

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