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  1. C

    could a civilization that lived on mars thousands of years ago leave visible

    signs that they were there? if there was a people that lived on mars and that were somehow extingushed leave behind some traces of their being there after say 25000 years or would all traces be gone?
  2. C

    could a civilization that lived on mars thousands of years ago leave visible signs

    that they were there? if there was a people that lived on mars and that were somehow extingushed leave behind some traces of their being there after say 25000 years or would all traces be gone?
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