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History of the Earth, Oceans and Life

History of the Earth, Oceans and Life. ~4.7 billion years ago (bya)- Earth forms ~4.2 bya- Oceans form ~3.6 bya- Life begins ~2.0 bya- Oxygen rich atmosphere ~570 million years ago (mya)- First animals ~65 mya- Dinosaurs go extinct ~1 mya- First hominids ~230 years ago- U.S.A is formed

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History of the Earth, Oceans and Life

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  1. History of the Earth, Oceans and Life ~4.7 billion years ago (bya)- Earth forms ~4.2 bya- Oceans form ~3.6 bya- Life begins ~2.0 bya- Oxygen rich atmosphere ~570 million years ago (mya)- First animals ~65 mya- Dinosaurs go extinct ~1 mya- First hominids ~230 years ago- U.S.A is formed ~29 years ago- Woody was formed

  2. Early Earth

  3. How Life Started

  4. electrodes to vacuum pump spark discharge CH4 NH3 H2O H2 gases water out condenser water in water droplets water containing organic compounds boiling water liquid water in trap

  5. membrane-bound proto-cells living cells self-replicating system enclosed in a selectively permeable, protective lipid sphere enzymes and other proteins DNA RNA formation of protein-RNA systems, evolution of DNA formation of lipid spheres spontaneous formation of lipids, carbohydrates, amino acids, proteins, nucleotides under abiotic conditions

  6. Archaebacterial Lineage Ancestors of Eukaryotes Noncyclic pathway of photosynthesis Cyclic pathway of photosynthesis Origin of Prokaryotes Aerobic respiration Eubacterial Lineage 3.8 3.2 2.5 billion years ago

  7. ARCHAEBACTERIA Extreme halophiles Methanogens Extreme thermophiles EUKARYOTES origins of animals Animals origins of eukaryotes origins of fungi Fungi Heterotrophic protistans origin of mitosis, meiosis Photosynthetic protistans Photosynthetic protistans endosymbiotic origins of mitochondria Plants origins of plants endosymbiotic origins of chloroplasts EUBACTERIA Oxygen-producing photosynthetic eubacteria Other photosynthetic eubacteria Heterotrophic and chemoautotrophic eubacteria 1.2 billion years ago 900 million years ago 435 million years ago

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