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? 
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Swedish Krona
Sweden's recognized currency, abbreviated SEK.
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Interest rates or currency exchange rates determined through analysis that are unaffected by expectations or speculation about future events.
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