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Variation
Differences in the genetics of organisms of the same species.
Selection pressure
Varying survival or reproductive ability of different organisms in a breeding population due to the influence of the environment.
Evolution
The cumulative change of heritable characteristics of a population.
Artificial selection
The breeding of plants and animals to produce desirable traits.
Homologous structures
Similar structures due to common ancestry.
Pentadactyl limb
Having limbs that end in five digits.
Continuous variation
Variation in a species, which is controlled by several genes producing features that cannot be divided into discrete categories (ex: human height).
Adaptive radiation
The diversification of a group of organisms into forms filling different ecological niches.
Vestigial structure
A structure in an organism that has lost all or most of its original function in the course of evolution, such as human appendices.
Species
A group of individuals of common ancestry that closely resemble each other and are normally capable of interbreeding to produce fertile offspring.
Note 
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