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Homo Sapiens Sapiens:
-It is us
-We are destroying 5 billion years of history in a few thousands

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Homo Sapiens:
-They made more complex sounds to share information
-200,000 years ago
-Oldest fossils, 160,000 years ago

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Stone Age:
-Fire under control
-They cooked food

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Genus Homo:
-2 million years ago
-They sharpened objects
-They began to master the use of hands and fingers

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Human evolution

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-Mammals in the trees became primates
-Several million years ago human life started to evolve:
·To see predators in the savanna apes started to walk on two legs
·Brain size increased rapidly

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Human life stage

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-After an ozone layer was created life could emerge on land, before this layer life was restricted to water
-541 million years ago hard-shelled invertebrates originated in oceans
-Since then life diversified:
·Age of fish
·Plants and fungi, first out of the water
·Fish near to land developed into amphibians, the first vertebrates on land
·Age of reptiles
·Mammals, 200 million years ago
·Birds, 150 million years ago
-250 years ago, the Permian Extinction, it was the extinction of 95% of all living species
-In the era of reptiles the supercontinent Pangea existed
-Extinction of dinosaurs 65 million years ago by an asteroid

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Life stage

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-The greenhouse effect wasn't strong enough and the planet froze for the next 300 million years

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Frozen stage

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-Cyanobacteria died, as well as much life on Earth, because oxygen was toxic for them (The Oxygen Catastrophe)
-Resistant forms developed the ability to use oxygen for their own good
-A methane greenhouse was formed

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Oxigen stage

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-More stable climate
-The Earth started to cool down
-Water vapor condensed to form oceans
-Continents could be created, Vaalbara was the first supercontinent
-Between 3.2 and 2.4 billion years ago photosynthetic organisms appeared
-Oxigen also appeared

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Stabilisation stage

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Collision of proto planets:
·Formation of the moon
·Appearance of chemical building blocks, DNA.

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-No life
-Extremely hot temperatures
-Usual volcanic activity
-Hellish environments
-Nebular atmosphere
-Early oceans

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Bomberdment stage

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Earth's stages

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The Earth 4.5 billion years ago was extremely hot, the oxygen didn't existed and asteroids frequently crashed onto it's surface. Because of this there were no life.

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Our Solar System

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Planets

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The Sun