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Population definition
Individuals of same species living in same place.
Population density
Number of individuals per area.
Factors increasing population
Birth rate, immigration.
Factors decreasing population
Death rate, emigration.
Exponential growth
Rapid growth with abundant resources.
Logistic growth
Growth slows as resources become limited.
Carrying capacity
Maximum population an environment can support.
Density-dependent factors
Competition, predation, disease.
Density-independent factors
Natural disasters, climate extremes.