Examlex
An atom with 4 electrons in its valence shell is ___.
Facial Expressions
The movements of the facial muscles that convey emotions, feelings, or intentions to others.
Sleep
A naturally recurring state of mind and body characterized by altered consciousness, relatively inhibited sensory activity, reduced muscle activity, and inhibition of nearly all voluntary muscles during rapid eye movement (REM) stages.
Alertness
The state of being quick to notice and respond to potential dangers or opportunities.
School Start Time
The designated time at which school classes begin for the day, which can significantly impact students' sleep, health, and learning.
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