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Use the graph to answer the following question.
In the figure, curves A-D depict per capita rate increases (r) . Which of the following best explains the difference between the shapes of these curves?
Density
A physical property representing mass per unit volume.
Serotonin
A neurotransmitter that plays a key role in mood regulation, appetite, sleep, and other physiological processes.
Dopamine
A neurotransmitter in the brain that plays a major role in reward-motivated behavior, movement, and cognitive functions.
Testosterone
The male sex hormone, high levels of which have been linked to aggression and violence in both animals and humans.
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