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Age of Earth
Conditions prevailing on early Earth
4-Step Hypothesis to Explain Origin of Life
Evidence supporting each of 4 steps
Oparin / Haldane hypothesis
Miller / Urey apparatus
Biogenesis
Origin of Life; oldest chemical evidence of life - age
Oldest prokaryotic fossils - age
O2 begins to appear in atmosphere - age
Banded iron
Importance of RNA
ribozymes
protobiont
micelles
Hypothetical mechanisms for reproduction and metabolism of protobionts
Natural selection of protobionts containing hereditary information
stromatolites
Oldest Eukaryotic life - age
serial endosymbiosis
Multicellularity
Snowball Earth
Animal embryos, ca. 570 MYA
Cambrian explosion
Colonization of terrestrial habitats
Major Lineages of Life
Linnaeus
Whittaker
Woese
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