If life ever existed on Mars, scientists expect that it would be small simple life forms called microbes. Mars likely never had enough oxygen in its atmosphere and elsewhere to support more complex organisms. Thus, large fossils are not likely.
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NASA’s Curiosity rover photographed an object on Mars last week that bore an uncanny resemblance to a femur or thigh bone. See some other amazing photos taken by NASA’s rovers on Mars so far this year.
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