Answer: IQUID WATER DUE TO LOW ATMOSPHERIC PRESSURE WHICH IS LESS THAN 1% OF THE EARTHS EXCEPT AT THE LOWEST ELEVATIONS FOR SHORT PERIODS. ( FOR FURTHER INFORMATION GO TO MARS - WIKIPEDIA https://en.m.wikipedia.org)
Explanation: MARS IS THE 4TH PLANET FROM THE SUN . IN MARS THE IRON OXIDE PREVALENT ON ITS SURFACE GIVES IT A REDDISSH APPEAREANCE THAT IS DISTINCTIVE AMONG THE ASTRONOMICAL BODIES VISIBLE TO THE NAKED EYE.
Mars is covered in hills, craters, and volcanoes. The planet has no liquid water. There are no oceans or lakes. This would make building shelter extremely difficult.
B. Mutations cause a person's body cells to divide uncontrollably. There isn't a signal for cells to stop dividing, so this can cause cancer because cancer cells won't stop dividing without this signal.
