Fossil Record, The record of the all the fossils ever discovered on earth, extinction, Event that occurs when the last individual organism of a species dies, biological evolution, The change over time in populations of related organisms, relative dating, Compares the ages of the sedimentary rock layers - younger near the top and older further down., absolute dating, Uses the decay of radioactive isotopes to determine the actual age of igneous rocks., variation, A slight difference in an inherited trait among individual member of a species., natural selection, The process by which organisms with variations that help them survive in their environment live longer, compete better, and reproduce more than those who do not have the variations., adaptation, An inherited trait that increases an organism’s chances of surviving and reproducing in a particular environment., selective breeding, The selection and breeding of organisms of desired traits, homologous structure, Body parts of organisms that are similar in structure and position but different in function, analogous structure, Body parts that perform a similar function but differ in structure., vestigial structure, Body part that has lost its original function through evolution, embryology, The science of the development of embryos from fertilization to birth.

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