Each statement below represents a feature that has been claimed to exist on Mars. Sort the statements 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 Mars1. Minerals of types known to form in liquid water2. surface pools of liquid warer3. microscopic life4. abundant water ice5. dried-up river beds6. a network of straight-line canals7. cities built by an ancient civilization8. underground pockets of liquid9. frequent rainfall and snowfall