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independent evolution of similar features in species of different periods or epochs in time

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having no living members; no longer in existence.

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two populations reproduce at different times of the day or in different seasons, causing speciation to occur.

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organisms that are separated from exchanging genetic material with other organisms of the same species.

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reproductive isolation based on the behavior of species in the context of mating rituals and signals.

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collection of evolutionary mechanisms, behaviors and physiological processes critical for speciation.

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group within a species separates from other members of its species and develops its own unique characteristics

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event that drastically reduces the size of a population.

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reduction in genetic variation that results when a small subset of a large population is used to establish a new colony.

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change in the frequency of an existing gene variant in a population due to random sampling of organisms.

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extreme values for a trait are favored over intermediate values.

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natural section in which genetic diversity decreases as the population stabilizes on a particular trait value.

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natural selection but in favor for only one.

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retention during the process of evolution of genetically determined structures or attributes that have lost some or all of the ancestral function in a given species.

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structures that are similar in unrelated organisms.

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similar structures that evolved from a common ancestor.

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concept in evolutionary biology applicable when one species is the ancestor of two or more species later in time.

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organisms better adapted to their environment tend to survive and produce more offspring.

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process of change by which an organism or species becomes better suited to its environment.

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quantitative representation of natural and sexual selection within evolutionary biology.

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preserved remains, impression, or trace of any once-living thing from a past geological age.

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Evolution is change in the heritable characteristics of biological populations over successive generations.