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mini threshold #1 photosynthesis(3.5 billion years ago)

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mini threshold #1 photosynthesis(3.5 billion years ago)

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the first of the mini thresholds is called photosynthesis. because in the begining of life forming on earth there were vents in the bottom of the sea that let out and fed microrganism's untill some evolved to use sunlight as a food source and create oxygen as a byproduct.

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mini threshold #2 Eukaryotes(2.5 billion years ago)

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mini threshold #2 Eukaryotes(2.5 billion years ago)

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the second mini threshold is called Eukaryotes. the reason behind that is the single-celled organisms that grew to use sunlight as a food source overtime chenged the earth's atmosphere from a co2 rich to an oxygen rich place, and the organsims that didnt learn to evolve wernt able to thrive in the now oxygen rich enviroment and died off leading the way for organism's that could thrive in the now oxygen rich atmosphere to life.

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mini threshold #3 muticelled (1 billion years ago)

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mini threshold #3 muticelled (1 billion years ago)

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after some time the eukaryotes bound together to create the very first multi-celled organisms like plants and early aquatic creatures.

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mini threshold#4 brains(500 million years ago)

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mini threshold#4 brains(500 million years ago)

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the fourth mini threshold marks the point in history in wich there waas an evolutionary step for mutli-celled organisms, this is the point in history in wich there was a place developed inside of mutlicelled oragnisms devoted for thought only.

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mini threshold#5 going on land(475 million years ago)

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mini threshold#5 going on land(475 million years ago)

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this mini threshold marks the point in history in wich multi-celled organisms went on dry land. the reason this is so important is they had to create entirely new ways of doing anything and everything, and this process was done by every type of multi celled organisms like plants to aquatic animals.

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mini threshold#6 mamals(250 million years ago)

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mini threshold#6 mamals(250 million years ago)

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at this point in time the switch from sea to land had been compleated, but they still either had to go back to the water to have kids or they had to give birth to an egg filled with fluid, but then another step in evolution occured, they were finally able to give birth fully on land without the need to go back to the water to give birth or by giving birth to an egg they were able to compleately grow there offspring inside of themselves.