Fossil Record - historical sequence of life indicated by fossils, Evolution - change of inherited characteristics within a population over generations, geology - the study of rocks and the Earth's crust, Paleontology - the study of fossils, Relative Dating - determining a fossil's age by comparing its placement with that of fossils in other layers of rock - DOES NOT give exact age, Absolute Dating - determining a fossil's age by using the isotopes it contains - DOES give an exact age, Ancestor - an early or ancient relative, Isotope - atoms of the same element that have different numbers of neutrons, Strata - layers of rock, Law of Superposition - new layers of rock form on top of old layers of rock, Mold Fossil - a fossil that has formed around an organism, leaving the imprint , Cast Fossil - a fossil that has formed in the original shape of the organism, Trace Fossil - fossil evidence of an organism's existence that doesn't contain the organism itself, Resin Fossil - an organism that has been fossilized in a type of resin that can preserve the entire body, Body Fossil - the body parts of the organism are fossilized, Homologous Structure - structures that are made up of the same parts and evolved from a common ancestor,

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