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Competition (biology)

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Two sea anemones compete for territory
A lion and a spotted hyena in the Maasai Mara: The two species share similar ecological niches, and so compete with each other

Competition is an interaction between organisms or species in which the fitness of one is lowered by the presence of another. According to evolutionary theory, this competition within and between species for resources plays a role in natural selection.

Competition occurs when organisms or species need or use the same resources. Common resources are food, water and territory.

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