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influence of closely associated species on each other in their evolution

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the independent evolution of similar features in species of different periods in time

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when a species population completely goes away

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differences in the timing of critical reproductive events prevent species to reproduce

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a term that refers to a population of animals, plants, or other organisms that are separated from exchanging genetic material

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when populations of the same species begin to develop different behaviors that are not recognized or preferred by members in another population

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inability of a species to breed successfully with related species due to geographical, behavioral, physiological, or genetic barriers

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formation of new and distinct species in the course of evolution

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event that drastically reduces the size of a population

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reduced genetic diversity which results when a population is descended from a small number of colonizing ancestors

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mechanism of evolution in which allele frequencies of a population change over generations due to chance

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an evolutionary force that drives a population apart

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any selective force or forces which push a population toward the average, or median trait

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force in nature that causes a population to evolve towards one end of a trait spectrum

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A part of the body that has a certain job to help function the body

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resemblance of structures that have different origins.

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similar structures that evolved from a common ancestor

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When two species have the same ancestor and share traits from that ancestor

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

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How a species adapts to certain environments

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How fit a species is for a certain environment

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process by which different kinds of living organisms are thought to have developed and diversified from earlier

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Remains of prehistoric animals