Examlex
A choppy stop-start pattern of operant responding is associated with the ________ schedule of reinforcement.
Widow
A woman who has lost her spouse by death and has not remarried.
Concentrate
To focus one's attention or mental effort on a specific object, task, or activity.
Sleeping
The natural state of rest characterized by altered consciousness, relatively inhibited sensory activity, and reduced muscle activity, vital for health and well-being.
Mortality
The state of being mortal or the incidence of death within a specific population or demographic.
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