Biology 17.2

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Biology 17.2

  1. 1. 17-2 Earth’s Early History<br />
  2. 2. Proteinoid Microsphere<br />Tiny bubble, formed of large organic molecules, that has some characteristics of cell.<br />
  3. 3. Microfossil<br />Microscopic fossil.<br />
  4. 4. Endosymbiotic theory<br />Theory that eukaryotic cells formed from a symbiosis among several different prokaryotic organisms<br />
  5. 5. Key Concept<br />Earth’s early atmosphere probably contained hydrogen cyanide, carbon dioxide, carbon monoxide, nitrogen, hydrogen sulfide, and water.<br />
  6. 6. Key Concept<br />Miller and Urey’s experiments suggested how mixtures of the organic compounds necessary for life could have arisen from simpler compounds present on a primitive earth.<br />
  7. 7. Key Concept<br />The rise of oxygen in the atmosphere drove some life-forms to extinction, while other life-forms evolved new, more efficient metabolic pathways that used oxygen for respiration.<br />
  8. 8. Key Concept<br />The endosymbiotic theory proposes that eukaryotic cells arose from living communities formed by prokaryotic organisms.<br />

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