Birth Rate - The number of births per 1,000 individuals in a given period., Death Rate - The number of deaths per 1,000 individuals in a given period., Immigration - Moving into a population., Emigration - Leaving a population., Population Density - The number of individuals in an area of a specific size., Carrying Capacity - The largest population an area can support., Natural Selection - The process in which organisms better adapted to their environment tend to survive and produce more offspring., Adaptations - The behaviors and physical characteristics that allow organisms to live successfully in their environments. , Niche - The role of an organism in its habitat., Competition - Struggle between organisms to survive as they attempt to use the same limited resources., Predation - Interaction in which one organisms kills another for food or nutrients., Mutualism - A relationship in which both species benefit., Commensalism - A relationship in which one species benefits and the other is neither helped nor harmed., Parasitism - A relationship that involves one organism living on, with, or inside another organism (host).,

Populations and Interactions

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