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Martian surface features include gullies and runoff channels, which suggest that _______ on the surface of Mars. A. there is life B. plants could grow C. humans can live D. liquid water once existed
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Martian surface features include gullies and runoff channels, which suggest that _______ on the surface of Mars. A. there is life B. plants could grow C. humans can live D. liquid water once existed

User Aaron Shafovaloff
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Those are features that are carved out by running water.
So even though they're empty now, their presence suggests
that liquid water once ran there.
User Jane Wilkie
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