Natural selection will occur When there is competition.
- Competition between living things is considered in Darwin's theory of the mechanism of evolution as a key component of the "fight for existence" and, consequently, as the foundation for natural selection.
- Members of the same species compete with one another within their own species. In the same location, for instance, two male birds of the same species can compete for mates.
- A fundamental element of natural selection is this kind of rivalry. It encourages a species' ability to evolve superior adaptations throughout time.
- The reduction of niche overlap when two species compete for the same finite resource may result in evolutionary changes in both species.
- Alternately, the competitively dominant species remains the same and may even be able to enlarge its niche, which limits the amount of available niche space.
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