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How Life Began. http://cmex.ihmc.us/VikingCD/Puzzle/Evolife.htm. 1. Physical and Chemical Characteristics. A. Early atmosphere was thicker with carbon dioxide and red in color. B. The ocean was olive in color C. Great Bombardment Asteroid/meteorite bombardment created harsh conditions.

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how life began
How Life Began

http://cmex.ihmc.us/VikingCD/Puzzle/Evolife.htm

1 physical and chemical characteristics
1. Physical and Chemical Characteristics
  • A. Early atmosphere was thicker with carbon dioxide and red in color.
  • B. The ocean was olive in color
  • C. Great Bombardment Asteroid/meteorite bombardment created harsh conditions

http://www.physicsoftheuniverse.com/topics_life_early.html

2 early environment survivor mexican cave analogy
2. Early Environment Survivor- Mexican Cave Analogy

Chemosynthetic bacteria: use Hydrogen Sulfide for energy source; survives in snotites or in phlemballs.

http://www.caveslime.org/Photos/Snottites

3 carbon
3. Carbon
  • A. Basis of living things.
  • B. Bonds to form diverse compounds.
  • C. Miller’s experiment- amino acids that contain carbon formed in harsh conditions similar to early Earth.
  • D. Old rocks in Greenland contain carbon.

http://www.geus.dk/viden_om/voii/ilulissat-uk/voii05-uk.html

4 great bombardment
4. Great Bombardment
  • A. Asteroid and comet bombardment
  • B. Tons of dust from the Universe bombards Earth.
  • C. Dust contains carbon, elements, compounds and minerals.
  • D. The building blocks of life, amino acids, form then peptides/protein.
  • E. Collision Simulation Experiment- amino acids survived force similar to comet impact and fused to form larger molecules or peptides.
5 environments where life could be protected from great bombardment
5. Environments where life could be protected from great bombardment
  • A. Underground- microbes live in dark places and use chemicals like methane, propane, and ethane, for food and energy: chemosynthesis.
  • B. Deep ocean- microbes live on chemicals like Hydrogen Sulfide for food and energy: chemosynthesis.
amino acids peptides and proteins
Amino acids, peptides, and proteins

www.chemicalconnection.org.uk

commons.wikimedia.org

www.sigmaaldrich.com

6 environment less hostile due to decreased bombardment
6. Environment less hostile due to decreased bombardment
  • A. Bacteria moved to shallow ocean and used Sun’s light energy, carbon dioxide and water to make food and release oxygen: photosyntheticbacteria.
  • B. Bacteria evidence found in stromatolites, the oldest fossils.
  • C. Cyanobacteria: first to use photosynthesis, releaseoxygen as a waste product.
  • D. Oxygen absorbed into oceans and combined with iron to form oxides.
  • E. Cyanobacteriastarts the increase of oxygen from 1% to 21% (today), allows diversity of life, forms O3 (ozone) which provides a protective layer vs. UV.
cyanobacteria
Cyanobacteria

http://www.uni-frankfurt.de/%7eschauder/cyanos/cyanos.html

http://commons.wikimedia.org/wiki/File:Efflorescence_verte_4_Cyanobacteria

stromatolites
Stromatolites

www.aslo.org

http://www.sharkbay.wa.gov.au/tourism/what_to_see_and_do/

http://www.geology.sdsu.edu/seminars/fall08/10_29_08.html

iron ore
Iron ore

http://www.constructionweekonline.com/article-9234-qatar-steel-secures-long-term-iron-ore-supply/

order of events of how life began
Order of Events of How Life Began
  • Solar Nebula
  • Accretion
  • Bombardment
  • Radioactive decay
  • Iron Catastrophe
  • Magnetic Field
  • Volcanoes
  • Plantesimal hits Earth- tilt
  • Moon moves away
  • Water on surface, crust forms
  • Great Bombardment
  • Chemosynthetic bacteria
  • Great bombardment ends
  • Photosynthetic bacteria form; cyanobacteria
order of appearance of living things on earth
Order of appearance of living things on Earth
  • 4 elements- C, O, N, H
  • Amino acids
  • Peptides
  • Proteins
  • Microbes-chemosynthetic
  • Cyanobacteria- photosynthetic
  • Multicellular organisms
  • Plants
  • Fish
  • Insects
  • Reptiles
  • Dinosaurs
  • Primates
  • First humans
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