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Each statement below represents a feature that has been claimed to exist on Mars. Sort the statements into the correct bin according to whether each is a feature that actually exists, that does not actually exist, or that might exist but about which we cannot yet draw a definitive conclusion.
Real Mars/Imaginary Mars/Unknown Mars
1. Minerals of types known to form in liquid water
2. surface pools of liquid warer
3. microscopic life
4. abundant water ice
5. dried-up river beds
6. a network of straight-line canals
7. cities built by an ancient civilization
8. underground pockets of liquid
9. frequent rainfall and snowfall
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Each statement below represents a feature that has been claimed to exist on Mars. Sort the statement...
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