-The graph plots the escape velocity of several solar system objects along the vertical axis, and 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) NH3 and He
C) CO2, NH3, and O2
D) H2 and He
Correct Answer:
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