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Question

NASA’s methodical approach to the exploration of Mars has not yet answered the questions of whether biological life forms ever emerged on Mars and whether, presuming such life forms having left fossil traces to begin with, those traces can still exist in some moist recesses of the cold and arid planet.

A
and whether, presuming such life forms having left fossil traces to begin with, those traces can
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B
and whether, if it is presumed that such life forms left some fossil traces to begin with, can those traces
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C
and whether, presuming such life forms left fossil traces to begin with, those traces
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D
and, presuming such life forms did leave some fossil traces to begin with, if they can
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E
and, presuming such life forms to have left fossil traces to begin with, if they
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Solution

The correct option is C and whether, presuming such life forms left fossil traces to begin with, those traces
"Having left fossil traces" seems to mean that its an event occurred earlier than "biological life forms"
This is not correct. This error is corrected only in option "C".

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