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Recipe For Life

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S: Abiogenesis

BC: Sources: http://ngm.nationalgeographic.com/2006/12/early-earth/appenzeller-text http://en.wikipedia.org/wiki/Abiogenesis#.22Primordial_soup.22_theory http://4.bp.blogspot.com/-Lff2FsYiSNE/TmRbn2kebLI/AAAAAAAAA2w/8yuaDb4u3Og/s1600/Ecosystem-definition-3.jpg http://astrobiology.nasa.gov/images/135.jpg http://image.tutorvista.com/content/feed/tvcs/amino20acid_0.JPG http://www.chem.duke.edu/~jds/cruise_chem/Exobiology/Pmilurey.gif http://www.ljes.org/app/webroot/userfiles/68/Image/science_labwork%281%29.gif

FC: Recipe for Life Primordial Soup Theory | by Jessica Mahinthakumar

2: Today's world is booming with life. Trees, bugs, plants, cats, dogs, elephants, people- there's life everywhere! Even in the most extreme conditions on Earth, we find life.

3: But "today's world" is about 4.6 billion years old! Long ago, when the Earth was only about 1 billion years old, things looked very different. We call this early Earth.

4: Early Earth was hot, filled with toxic fumes, and erupting volcanoes. These conditions are lethal to we humans- but this is when and where the very first instance of life arose.

5: The atmosphere was made up of mostly hydrogen, water vapor, carbon dioxide, hydrogen sulfide, and smaller amounts of nitrogen, carbon monoxide, ammonia and methane. This is very different from Earth's atmosphere today.

6: Many scientists think that in this warm, wet atmosphere was a "primordial soup", and the first life started in a body of water. Now the first life wasn't a human, or cat, or insect- it would have been much smaller. It was probably a very basic, tiny bacteria that couldn't do much other than eat and divide to form more bacteria. This idea of life ( the bacteria) coming from non-life (the primordial soup) is called abiogenesis.

8: A primitive instance of life like bacteria is made of many components and complex molecules such as DNA, and proteins. Proteins are made of amino acids (like how links form a chain).

9: In 1952, two scientists Miller and Urey conducted an experiment to see what would happen if they made their own "primordial soup". The two men tried to recreate the conditions in early Earth, and when they added lightening- something amazing happened!

10: Amino acids formed out of their soup! Remember that amino acids are the building blocks of proteins, and proteins are the building blocks of life.

11: This experiment was very exciting news for scientists everywhere, because it showed how the first life may have arisen. Other scientists are still researching and learning more about abiogenesis and the "recipe for life".

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  • By: Jess K.
  • Joined: over 4 years ago
  • Published Mixbooks: 1
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  • Title: Recipe For Life
  • How life came to be...
  • Tags: nature
  • Published: over 4 years ago

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