The intraspecific struggle is most acute, since the individuals have the same ecological niche. Organisms compete for limited resources – food, territorial, males of some animals compete with each other for fertilization of the female, as well as other resources. To reduce the severity of intraspecific struggle, organisms develop various adaptations – delineation of individual areas, complex hierarchical relationships. In many species, organisms at different stages of development occupy different ecological niches, for example, coleopteran larvae live in the soil, and dragonflies live in water, while adults inhabit the ground-air environment. Intraspecific struggle leads to the death of less adapted individuals, contributing to this natural selection.
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