Density dependent factor - Any factor influencing population regulation that has greater impact as the density increases, Competition - Rivalry between individuals of the same or different species for specific resources, Competitive Exclusion Principle - Two species are unable to compete for the resources in the same niche, Niche - A species' role and position in its environment; a species' interactions with the biotic and abiotic factors of its environment, Character displacement - The evolutionary divergence of characteristics displayed by two or more species with the same niche in a particular habitat, Resource partitioning - Division of environmental resources by coexisting species populations to avoid competition for resources., Density independent factor - An abiotic factor (that is independent of the density of the population) that affects the size of a population., Limiting factors - Conditions that limit the growth, abundance or distribution of an organism or a population of organisms., Predation - a biological interaction where one organism, the predator, kills and eats another organism, its prey., Infection - The invasion and multiplication of microorganisms such as bacteria, viruses, and parasites that are not normally present within the body.,

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