avoiding predators has a positive impact on the organism & elk circle destroy their show in pockets spinal to avoid alkali ->  cactus wrens building their nests in cholla cacti has a positive impact on themselves  cactus wrens building their nests in cholla cacti has a positive impact on themselves & commensalism is a relationship between two organisms in which one benefits while not harming the other one & breaks majority capital states in equal taste does not protect the autotroph heats -> the relationship between cactus wrens and cholla cacti is commensalism