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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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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 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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the process through which the characteristics of organisms change over successive generations, by means of genetic variation and natural selection. 

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the process through which the characteristics of organisms change over successive generations, by means of genetic variation and natural selection. 

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the action or process of adapting or being adapted.

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the action or process of adapting or being adapted.

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the advantageous traits (that help certain individuals survive and reproduce) are said to be “selected” or favored by natural selection and are thus perpetuated through later generations.

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the advantageous traits (that help certain individuals survive and reproduce) are said to be “selected” or favored by natural selection and are thus perpetuated through later generations.

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the branch of science concerned with the bodily structure of humans, animals, and other living organisms, especially as revealed by dissection and the separation of parts.

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the branch of science concerned with the bodily structure of humans, animals, and other living organisms, especially as revealed by dissection and the separation of parts.

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 Also called Darwinian fitness. Biology. 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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 Also called Darwinian fitness. Biology. 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. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution.

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the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution.

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Relative dating is 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, (i.e. estimated age).

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Relative dating is 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, (i.e. estimated age).

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a structure in an organism that has lost all original function

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a structure in an organism that has lost all original function

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natural arrangement of animals and plants

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natural arrangement of animals and plants

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any person to whom two or more persons claim descent

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any person to whom two or more persons claim descent

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when the characteristics of an organism changes over generations

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when the characteristics of an organism changes over generations

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study of the structure of humans, animals, and other organisms

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study of the structure of humans, animals, and other organisms

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contribution of an individual to the next generations gene pool

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contribution of an individual to the next generations gene pool

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when an organism is better adapted to its environment it will be more likely to survive

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when an organism is better adapted to its environment it will be more likely to survive

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used to determine the relative order of past events

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used to determine the relative order of past events