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? 
Definitions:
African-American Males
Refers to males of African descent living in the United States, often discussed in contexts of social, economic, and health disparities.
Violent Crime
Criminal acts that involve force or the threat of force against others, including but not limited to homicide, rape, robbery, and assault.
Implicit Prejudice
Unconscious biases or attitudes toward people or groups without conscious knowledge.
Anti-Gay Prejudice
Negative attitudes, beliefs, or discrimination directed towards individuals who are gay or perceived to be gay.
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