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2.8 Biotic and Abiotic Influences on Ecosystems A factor that restricts the size of a population or where it can live is called a LIMITING FACTOR ABIOTIC limiting Factors determine where a specie is able to live Some examples include: Temperature Precipitation Light BIOTIC limiting Factors determine how easily a specie can survive in an ecosystem Some examples include: Competition – two organisms compete for a common prey Preditation – one organism feeds on another Mutualisms – two organisms benefit each other Parasitism – one organism lives on or in a host and feeds off it (ex. tapeworms) CARRYING CAPACITY: Carrying Capacity is the maximum population size of a species that a given ecosystem can handle (food, water, space …).