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 average speeds of gas particles as a function of temperature for various gases.Which gas(es) plotted in the diagram could be retained in the atmosphere of Mars? 
Definitions:
Physiologically Aroused
The condition of having one's body in a heightened state of alertness, often in response to a stimulus.
Epigenetic Molecules
Chemical compounds that modify the genome without changing the DNA sequence, affecting how genes are expressed.
High Serotonin Levels
A condition characterized by an excess amount of serotonin, a neurotransmitter, which can lead to various physiological and psychological effects.
Father-Absent Homes
Households where the father is not present or living with the family, impacting various aspects of child development.
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