Humans cannot survive on the surface of Mars for long periods of time because
A) there is not enough oxygen in the atmosphere.
B) the range in temperature between day and night is too large.
C) the flux of ultraviolet radiation reaching the surface is too high.
D) All of the above are valid reasons.

Question

Quizplus · Accepted Answer

All three options are valid reasons why humans cannot survive on the surface of Mars for long periods of time. There is not enough oxygen in the atmosphere to sustain life, the temperature range is too extreme, and the flux of ultraviolet radiation is too high and can damage human cells.

Humans Cannot Survive on the Surface of Mars for Long