Living organisms in nature live not separately from each other. Each organism surrounds a great number of other representatives of wildlife. And all of them anyway interact among themselves. One of types of biotic interaction is the competition.
The competition (Latin to concurro - I face) - fight, rivalry. In biology the competition represents fight for a limited resource necessary for life. Fight for existence, according to Charles Darwin's views, is the driving force of evolution. Under ideal conditions for life the organisms would breed infinitely, under the exponential law, and the incentive to evolutionary development would be absent. In fight for existence Darwin allocated three forms: intraspecific fight, trans-species fight, fight against adverse factors of the external environment. The intraspecific borbaborba between individuals of the same look is considered the most intense form of fight for existence. It is caused by the fact that individuals of one look most closely contact with each other. Food, the territory, an individual of an opposite sex can become the limited resource generating the intraspecific competition. Intraspecific fight escalates at increase in density of population. Trans-species borbamezhvidovy fight is shown in various forms. Organisms of different types compete for food and the attractive habitat. Or, for example, one look uses another (predatoriness, parasitism). Anyway, trans-species fight gives a powerful incentive to emergence of various adaptable mechanisms. It also is clear: the noncompetitive type of organisms in the nature perishes. Fight against adverse factors a sredytrety form of fight for existence is fight against adverse external conditions. Naturally, factors of inanimate nature (light, temperature, humidity, pressure, a radiation background, etc.) have strong impact on evolution of live. For example, plants in the desert fight against a drought: they have various devices allowing to extract water from deep soil layers, the intensity of a tanspiration decreases (evaporations of water through ustiyets). Influence of external conditions can weaken or strengthen intraspecific and trans-species relationship. So, at a lack of heat or light the intraspecific fight between plants escalates, but at surplus of the same resources - weakens.