Evolution. Ice ages may explain ancient bison's boom-bust history.
Pennisi
Elizabeth
E
D000413:Alaska; D000818:Animals; D005075:Biological Evolution; D016164:Bison / Q000145:classification / Q000235:genetics; D002170:Canada; D002980:Climate; D004272:DNA, Mitochondrial / Q000235:genetics; D005580:Fossils; D014644:Genetic Variation; D006802:Human Activities; D006801:Humans; D011157:Population Dynamics; D017422:Sequence Analysis, DNA; D013995:Time
D004272:DNA, Mitochondrial