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if i tell u from the beginning earth was a a real hott planet,it had a temperature of more than 1000 degree celsius for thousand of years as it was close to the sun,then slowly and slowly earth moved away from the sun as the years passed by.thus the hott planet (earth) slowly cooled down and our planet slowly become blue planet,with the years passing by life entered into the earth in the form of unicellular animals(eg. amoeba) and thus gradually life in the form of unicellular animals developed into multicellular and so on...... if u dont find this answer suitable u can report to me and also tell me wat u need hope it will help

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15y ago

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