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Chp. 15, Section 2
Vocab for 15.2 Biology
| 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 geographic distribution of living organisms and fossils on Earth |
| Homologous structure | An anatomical structure in one species that, compared to other anatomical structures in another species, originated from a single anatomical structure in a common ancestor of the species |
| Analogous structure | An anatomical structure in one species that is similar in function and appearances, but not in evolutionary origin, to another anatomical structure in another species |
| 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 species or taxonomic group; the relationships by ancestry among species or taxonomic groups |
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