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Biology Chapter 15

Biology Chapter 15 Section 2

TermDefinition
fossil the trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock
superposition a principle that states that younger rocks lie above older rocks if the layers have not been disturbed
relative age the age of an object in relation to the ages of other objects
absolute age the numeric age of an object or event, often stated in years before the present, as established by an absolute-dating process, such as radiometric dating
biogeography the study of the geographical distribution of living organisms and fossils on Earth
homologous structure anatomical structures that share a common ancestry
analogous structure they have closely related functions but do not derive from the same ancestral structure
vestigial structure a structure in an organism that is reduced in size and function and that may have been complete and functional in the organism's ancestors
phylogeny the evolutionary history of a species or taxonomic group
Created by: cordier.marie
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