Examlex
In an open system both energy and matter flow into and out of the system.
First- To Fifth-Graders
Children attending the first through fifth grades of elementary school, typically ranging in age from approximately six to eleven years old.
Sleep Per Night
The total duration of sleep an individual achieves within a 24-hour period, critical for health and wellbeing.
Hours
Units of time equal to 60 minutes, used to measure the duration of events, work, or other activities.
Prefrontal Cortex
The part of the brain located at the front of the frontal lobe, associated with decision making, problem-solving, control of purposeful behaviors, consciousness, and emotions.
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