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evolutionchange (in species) over time
extincthaving died out; leaving no more left
fossilpreserved remains or evidence of a living thing
fossil recordmost complete biological record of life on earth
half-lifetime it takes for half the atoms of a radioactive element to decay
homologous structuresstructure that evolved from similar body parts
law of superpositionlaw that states younger sedimentary rock layers lie on top of older
macro-evolutiontheory that all living things on earth arose from a common ancestor
micro-evolutiontheory based on observation: changes take place within a species
radioactive datingmethod based on radioactive decay of elements to date fossils or rocks

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