Which of the following explains why we do not consider the surface of Mars to be habitable today?
A) Mars has too much carbon dioxide in its atmosphere.
B) Mars is located far outside the Sun's habitable zone.
C) The atmospheric pressure is too low for liquid water to be stable on the surface.
D) Mars is bombarded too often with asteroids and comets.
E) Mars has too little gravity for its surface to be habitable.
C) The atmospheric pressure is too low for liquid water to be stable on the surface.
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Refer to the figure above showing the abundance of elements in the galaxy relative to hydrogen. Why are elements with even numbers of protons more abundant, on average, than elements with odd numbers of protons?
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