Using the graph below,determine the gas that has the lowest density at STP. 
Definitions:
Reinforced
Reinforcement is a process in behavioral psychology where a behavior becomes more likely to occur in the future due to the consequences it produces.
Endocrine System
A network of glands that produce and release hormones into the bloodstream to control various body functions.
Cortisol
A steroid hormone produced by the adrenal glands, often released in response to stress and low blood-glucose concentration, playing an important role in the body's fight-or-flight response.
Method of Transmission
The way in which a disease spreads from one individual or organism to another.
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