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Daniel Webster insisted that the national government had been created by an agreement between sovereign states, each of which retained the right to prevent the enforcement within its borders of acts of Congress that exceeded the powers specifically spelled out in the document.
Serotonin
A neurotransmitter involved in emotional arousal and sleep; deficiencies of serotonin have been linked to eating disorders, alcoholism, depression, aggression, and insomnia.
Emotional Arousal
The process of becoming mentally and physically activated with emotions, which can be triggered by thoughts, memories, or external events.
Gamma-aminobutyric Acid
A neurotransmitter in the brain that plays a key role in reducing neuronal excitability throughout the nervous system.
Endocrine System
A network of glands in the body that secrete hormones directly into the circulatory system to regulate the body's growth, metabolism, and homeostasis.
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