29topic_3_f07

29topic_3_f07 - Topic 3 Evolution of Life Itself Formation...

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Topic 3 Topic 3 Evolution of Life Itself Evolution of Life Itself
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Formation of Earth Formation of Earth The Big Bang The Big Bang 12-15 billion years ago All matter in a single mass of small atoms single mass of small atoms Fusion Fusion of hydrogen, helium etc into large atoms Our sun formed sun formed 6 billion years ago from from gases gases 4.6 billion years ago planets planets of our solar system formed by gas condensation formed by gas condensation
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Formation of Earth Formation of Earth Structure of Earth Structure of Earth Four layers formed Inner core Inner core of mostly iron and nickel Molten outer core outer core of iron and sulfur Plastic mantle” Plastic mantle” of iron, magnesium, aluminum silicon and oxygen 4.1 billion years ago a thin crust thin crust formed
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Formation of Earth Formation of Earth The Earth’s Atmosphere The Earth’s Atmosphere Formed by volcanic activity volcanic activity and gravity gravity Composed of water , nitrogen , carbon dioxide , hydrogen and carbon monoxide A reducing atmosphere reducing atmosphere At first all water in vapor phase but with cooling much became liquid Sun’s energy involved in water cycle
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History of Life on Earth History of Life on Earth Organic synthesis Organic synthesis Abiotic synthesis of organic Abiotic synthesis of organic compounds compounds started sometime after 4.1 billion years ago 3.8 billion years ago carbon carbon isotopes isotopes found
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History of Life on Earth History of Life on Earth Protobionts Protobionts With the accumulation of organic molecules some sort of associations must have occurred. This would have required concentration of the organic molecules. The kinds of molecules envisioned for these assemblages are amino acids amino acids , purines purines , pyrimidines pyrimidines , lipids lipids , oligosaccharides oligosaccharides , polypeptides polypeptides etc. They would have had to have such properties as selective permeability and maybe catalysis . .
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History of Life on Earth History of Life on Earth Prokaryotes Prokaryotes The protobionts probably occurred about 3.8 billion years ago since fossils of primitive bacterial like fossils are 3.4 billion years old. From fossil
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29topic_3_f07 - Topic 3 Evolution of Life Itself Formation...

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