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Chapter 15

Section 2

TermDefinition
the trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock fossil
a principle that states that younger rocks lie above older rocks if the layers have not been disturbed superposition
the age of an object in relation to the ages of other objects relative 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 absolute age
the study of the geographical distribution of living organisms and fossils on Earth biogeography
anatomical structures in one species that, compared to other anatomical structures in another species, originated from a single anatomical structure in a common ancestor of the two species homologous structure
an anatomical structure in one species that is similar in function and appearance, but not in evolutionary origin, to another anatomical structure in another species analogous 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 vestigial structure
the evolutionary history of a species or taxonomic group; the relationships by ancestry among species or taxonomic groups phylogeny
Created by: fasolak16
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