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Smokers who switch to low-tar or low-nicotine cigarettes
Ecology
Study of the interactions of organisms with other organisms and with the physical and chemical environment.
Environmental Resistance
The combined physical, chemical, and biological limiting factors that restrict the growth, abundance, or distribution of an organism or a population within an environment.
Communities
Social groups of any size whose members reside in a specific locality, share government, and often have a common cultural and historical heritage.
Environmental Resistance
The sum of environmental factors (like predation, competition, and disease) that limit the population growth of an organism.
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