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Biologists indicate that at least half of the 1.9 million species alive today will become extinct over the next few centuries.
Yerkes-Dodson Law
A theory suggesting that there is an optimal level of arousal for performance, and that too much or too little arousal can adversely affect task performance.
Task Difficulty
The level of challenge presented by a task, which can influence a person's performance and effort required to complete it.
Stimulus Motives
Drives or urges stemming from external sources that motivate behavior to satisfy a need or achieve a goal.
Bored
A state of feeling disinterested, restless, or unengaged due to a lack of stimulation or interest in the current activity or surroundings.
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