Examlex
Solve the system by substitution.
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REM Sleep
A phase of sleep characterized by rapid eye movement and vivid dreaming, playing a key role in learning and memory.
Animals
Multicellular, eukaryotic organisms in the kingdom Animalia that are characterized by their ability to move, reproduce sexually, and consume organic material.
Sleep
A natural, periodic state of rest for the mind and body, characterized by altered consciousness and reduced responsiveness to external stimuli.
Hours
Units of time equivalent to 60 minutes, used to measure the duration of events or the intervals between them.
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