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How life began on earth is one of the biggest puzzles that scientists found hard ______.

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Heistryingtoexplainhow________beganontheearth.

life lives the life a life

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24.______lifebeganonearthisoneofthebiggestpuzzlest

How; solving When; to be solved How; to solve Which; to solve

26.______lifebeganontheearthisoneofthebiggestpuzzl

How What Where That

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._________lifebeganontheearthisoneofthebiggestpuzz

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