extinction, when the environment changes and the organisms in a species cannot adapt, adaptation, the ability of an organism to survive in its environment ; a characteristic an organism is born with that helps it survive (i.e. giraffe's long neck), sexual reproduction, naturally occurring variations (differences) with a species are the result of mutations & _?_, evolution , a change in species over time, survival of the fittest, organisms who are best adapted to the environment live to reproduce, Darwin, scientist who went to the Galapagos Islands, studied finches, and came up with "survival of the fittest", top, rock layer that has the youngest fossils, bottom, rock layer that has the oldest fossils, natural selection, Organisms with helpful traits survive, reproduce, and pass those traits on to their offspring..

Evolution

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