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Biology: Chapter 152
Chapter 15.2 Vocabulary
Term | Definition |
---|---|
Fossil | remains or traces of an organism that died long ago |
Superposition | states that if the rock strata at a location have not been disturbed, the lowest stratum was formed before the strata above it |
Relative Age | age compared to that of other fossils |
Absolute Age | the time since formation |
Biogeography | the study of the locations of organisms around the world |
Homologous Structure | anatomical structures that occur in different species and that originated by heredity from a structure in the most recent common ancestor of the species |
Analogous Structure | anatomical structures that have closely related functions but do not derive from the same ancestral structure |
Vestigial Structure | structures that serve no purpose but that resemble structures with functional roles in related organisms |
Phylogeny | the relationships by ancestry among groups of organisms |