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In the physical sciences, abiogenesis, the question of the origin of life, is the study of how life on Earth might have emerged from non-life sometime between 4.4 billion years ago, when liquid water first flowed on the Earth,[1] and 2.7 billion years ago when the earliest uncontroversial evidence of life is found in the form of stable isotopes[1][2] and molecular biomarkers pointing to photosynthesis.[3][4]