organisms might have chanced upon the occasional oasis in which they could survive and multiply. If life arose on Mars or was delivered to Mars from Earth, it is possible that it has survived in localized environments that may be more hospitable than the general surface. Thus, there are plausible scenarios in which a sample returned from Mars could contain living organisms, either active or dormant.
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2 THE POSSIBILITY OF EXTANT LIFE ON MARS ."
Mars Sample Return: Issues and Recommendations . Washington, DC: The National Academies Press,
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