An adaptation is a characteristic that enhances the survival or reproduction of organisms that bear it.

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#XL - T Zoology

Clumped: The most common dispersion pattern is clumped, because resources tend to be clustered in nature. 

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#XL - T Zoology

Uniform: Competition may cause a uniform dispersion pattern between individuals. The pattern of trees and seedlings may appear random as seedlings develop from seeds dropped at random.

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1. The dispersion pattern starts out random but ends up uniform.
2. Uniform dispersions may also result from social interactions.
3. Territoriality between animals also causes uniform dispersion patterns.

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Random: The rarest dispersion pattern is random because resources in nature are rarely randomly spaced.

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Perfect compensation hypothesis

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Age-specific fertility rate - Any given age, Proportion of female offspring that are born to females of reproductive age.