title: Evolutionary contingency.
authors.affiliation: Department of Paleobiology, MRC-121, Smithsonian Institution, Washington, DC 20013-7012, USA. erwind@si.edu
authors.forename: Douglas H
authors.initials: DH
authors.lastname: Erwin
mesh_terms: D000220:Adaptation, Biological; D000818:Animals; D005075:Biological Evolution; D012641:Selection, Genetic