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Evolution a process in which something passes by degrees to a different stage (especially a more advanced or mature stage) http://farm4.staticflickr.com/3217/3059248309_62b112a7ff.jpg Artificial selection selection by humans for breeding of useful traits from the natural variation among different organisms http://farm4.staticflickr.com/3216/2484793078_7c84a2040f.jpg Natural selection a natural process resulting in the evolution of organisms best adapted to the environment http://farm4.staticflickr.com/3614/3437130714_9f1ef57383.jpg Fossil the remains (or an impression) of a plant or animal that existed in a past geological age and that has been excavated from the soil http://farm5.staticflickr.com/4047/4199742523_241aca818d.jpg Variation (biology) an organism that has characteristics resulting from chromosomal alteration http://farm6.staticflickr.com/5140/5516479724_448d7c1f9a.jpg Adaptation (physiology) the responsive adjustment of a sense organ (as the eye) to varying conditions (as of light) http://farm1.staticflickr.com/189/497148815_cceff4cb28.jpg Extinction a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus http://farm4.staticflickr.com/3582/3500940292_ba50474fdc.jpg Fossil record chronological collection of life's remains in sedimentary rock layers http://farm3.staticflickr.com/2299/4514409388_dd1da2b8e6.jpg