Examlex
Compared to animals such as birds, humans have ____.
Marijuana
A psychoactive drug from the Cannabis plant used for medical or recreational purposes, known for its effects on mood, perception, and behavior.
Serotonin
A neurotransmitter involved in the regulation of mood, appetite, and sleep, among other functions.
Ecstasy
Often referring to MDMA (methylenedioxymethamphetamine), a psychoactive drug primarily used for recreational purposes to enhance sensations of emotional warmth and increased energy.
Circadian Clock
An internal mechanism that regulates biological rhythms and cycles, affecting sleep, wakefulness, and other physiological processes in a roughly 24-hour cycle.
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