Ecology is the study of interactions between organisms and their environment. There are several levels of ecological organization from individual species to ecosystems. Species interact through relationships like competition, predation, and various types of symbiosis such as mutualism, commensalism, and parasitism. Organisms exhibit adaptations like mimicry and camouflage that allow them to survive within their ecological niches. North Carolina contains various ecosystems including coastal, estuary, forest, and urban environments.