In biology, competition refers to the rivalry between or among living things for territory, resources, goods, mates, etc. It is one of the many symbiotic relationships occurring in nature. Same or different members of species compete for resources, especially for limited natural resources. Competition may be intraspecific or interspecific. Intraspecific competition is a form of competition between members of the same species. An example of intraspecific completion is plants of same species (e.g. trees that grow very close together vie for sunlight and soil nutrients.