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MB 15.2
MB Chapter 15, Section 2
Term | Definition |
---|---|
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 | structures that 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 |