The graph below plots the escape velocity of each planet along the vertical axis and its surface temperature along the horizontal. The lines plotted in the figure are the speeds of the fastest gas particles as a function of temperature for various gases. Which of the gases plotted in the diagram could be retained in the atmosphere of Mars? 
A) only CO2
B) only NH3
C) CO2, NH3, and O2
D) only H2
E) H2 and He
Correct Answer:
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