Where is the oxygen on Mars today? How do you know?a. It leaked away into space due to the weak gravity, as observed in dissipation of matter ejected by geysers.b. It is locked within chemical compounds as oxides in the soils, as is evident by the reddish color of Mars's surface.c. It is mostly not outgassed from the planet's interior yet, as is evident by the low average density of Mars.d. It is locked within carbon in the atmosphere and polar caps as CO2, as is evident by mathematical modeling of atmospheric evolution.

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