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Competition Among Organisms Why Organisms Compete Limited supplies of resources will cause organisms to fight over those resources. Resources include: Water, food, sunlight, and living space. Competition can occur between members of the same species or between members of different species. Same Species Competition Compete over territory. 2 male birds of the same species may fight over a territory that would allow them to make a nest, eggs, and feed offspring. This type of competition is very important in evolution. Trees also compete. Those that are the tallest or that have the best root system are survivors. Competition Between Species Usually caused by limited resources, such as food and water. The 2 species can usually coexist. Hawks and owls both eat mice-hawks hunt during the day and owls hunt at night. This can also be very important for evolution. Nonnative Species A nonnative species is one that is new to the ecosystem-it has never existed there before. These can cause harm to an ecosystem by harming the environment or by harming the health of the organisms. When this happens it is called an invasive species. Invasive Species Invasive species are the second greatest destroyers of biodiversity. Human actions are the main cause for invasive species. When people move far away, they take insects and small organisms with them unintentionally. These species disrupt their new ecosystem, usually causing extinction. Increased travel and trade are also major ways an invasive species enters an area.