How life began
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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

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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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