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 A structure in an organism that has lost all or most of its original function in the course of evolution, such as human appendixes

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 A structure in an organism that has lost all or most of its original function in the course of evolution, such as human appendixes

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 the natural arrangement and apportionment of the various forms of animals and plants in the different regions and localities of the earth

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 the natural arrangement and apportionment of the various forms of animals and plants in the different regions and localities of the earth

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in genealogy, any person to whom two or more persons claim descent; also, the most recent ancestral form or species from which two different species evolved

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in genealogy, any person to whom two or more persons claim descent; also, the most recent ancestral form or species from which two different species evolved

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any genetic change in a population that is inherited over several generations. These changes may be small or large, noticeable or not so noticeable

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any genetic change in a population that is inherited over several generations. These changes may be small or large, noticeable or not so noticeable

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any alteration in the structure or function of an organism or any of its parts that results from natural selection and by which the organism becomes better fitted to survive and multiply in its environment

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any alteration in the structure or function of an organism or any of its parts that results from natural selection and by which the organism becomes better fitted to survive and multiply in its environment

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be “selected” or favored by natural selection and are thus perpetuated through later generations

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be “selected” or favored by natural selection and are thus perpetuated through later generations

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the science concerned with the study of the structure of biological organisms

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the science concerned with the study of the structure of biological organisms

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the genetic contribution of an individual to the next generation's gene pool relative to the average for the population, usually measured by the number of offspring or close kin that survive to reproductive age

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the genetic contribution of an individual to the next generation's gene pool relative to the average for the population, usually measured by the number of offspring or close kin that survive to reproductive age

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

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

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the science of determining the relative order of past events (i.e., the age of an object in comparison to another), without necessarily determining their absolute age

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the science of determining the relative order of past events (i.e., the age of an object in comparison to another), without necessarily determining their absolute age

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Lost its original purpose after evolution

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Lost its original purpose after evolution

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spreading amounts of species around the world

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spreading amounts of species around the world

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change over time slowly throughout generations

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change over time slowly throughout generations

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using other stuff to determine the age of another item

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using other stuff to determine the age of another item

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useful traits for survival of future generations

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useful traits for survival of future generations

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upgrading and adjusting to be comfortable

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upgrading and adjusting to be comfortable