Author: Khan Academy via YouTube
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Populations are characterized by density and dispersion. Density is the number of individuals within a specific area. Dispersion—the spread of individuals in their habitat—can be clumped, uniform, or random, like fish schools, evenly-spaced penguin nests, or wind-dispersed plants. Population size changes over time due to births, deaths, immigration, and emigration, with growth or decline depending on these factors.

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