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http://science.sciencemag.org/content/343/6169/1242777

A Habitable Fluvio-Lacustrine Environment at Yellowknife Bay, Gale Crater, Mars The Curiosity rover discovered fine-grained sedimentary rocks, which are inferred to represent an ancient lake and preserve evidence of an environment that would have been suited to support a martian biosphere founded on chemolithoautotrophy. This aqueous environment was characterized by neutral pH,...

https://www.ets.org/s/gre/pdf/practice_book_biochem.pdf

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