Immigration - The number of organisms moving in/out of an area/habitat, Migration - Seasonal movements of animals to find resources, Fecundity - The ability to produce a high number of offspring (similar to fertility), Seasonality - Changes in a habitat due to the time of year., Climate change - Changes in abiotic factors including temperature and weather., Habitat Destruction - Changing an area, changing its biotic or abiotic conditions, so that it is no longer favourable for the species that would naturally live there., Natality - Birth rate within a population, Mortality - Death rate within a population, Competition - organisms fighting for/trying to use the same resources,

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