Lately there has been a lot of talk about biosignatures. I've even come across articles where they talk about using biosignatures to look for life beyond earth in the rocks here on earth by searching for biosignatures of past life in rocks. I'm just curious, what can you really learn about past life on earth and beyond by looking at these biosignature? What can we learn about past life on earth and beyond by looking at these biosignatures? 

Thank you,

Ken

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