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Compare allopatric and sympatric speciation.
Pressure
The application of force upon a surface by an object, fluid, etc., in contact with it, often leading to stress or strain.
Stress
A physical, mental, or emotional factor that causes bodily or mental tension.
External Frustration
Emotional or psychological stress resulting from blockages or hindrances caused by environmental factors outside an individual's control.
Avoidance-Avoidance Conflict
A psychological dilemma wherein an individual must choose between two undesirable outcomes.
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