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Ch 15 sec 2
Ch 15 Sec 2
| Question | Answer |
|---|---|
| Fossil | the trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock |
| Superpostion | 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 |
| Bigeography | the study of the geographical distribution of living organisms and fossils on Earth |
| Homologous Structure | anatomical structures that share a common ancestry |
| Analogous Structure | in comparisons of different organisms, describes features that are similar in function and appearance but not in structure or origin |
| 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 relationships by ancestry among groups of organisms. |
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celesteb34
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