Show simple item record Knoll, Andrew H. en 2010-03-25T14:54:02Z en 2010-03-25T14:54:02Z en 2010-02-09 en
dc.identifier.uri en
dc.description.abstract Shells, bones, tracks, and trails record a history of animal evolution more than 600 million years long. Earth, however, is some four and a half billion years old. What kinds of life characterized our planet's youth and middle age? Genealogical relationships among living organisms, inferred from molecular sequence comparisons, suggest that the deep history of life is microbial, and over the past three decades, paleontologists have discovered a rich record of microbial life in rocks that long predate the earliest animals. Geochemical research has established a complementary record of environmental change, with major transitions that parallel those found among fossils. The general pattern that emerges is one of long-term co-evolution between life and environments throughout our planetary history. en
dc.language.iso en_US en
dc.publisher Indiana University William T. Patten Foundation en
dc.relation.isversionof Click on the PURL link below in the "External Files" section to play this video. The audio-only mp3 file is also available below in the "Files" section. en
dc.relation.uri en
dc.title Life on a Young Planet en
dc.type Presentation en

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