Question

what conditions prevailed on the earth during the origin of the cells

Answer 1

there is no such atmosphere present..
gradually some gaseous substance mixed with that of UV rays to form a layer of primitive atmosphere than give birth to cell

Answer 2

This review attempts to situate the emergence of life on the early Earth within the scientific issues of the operational and mechanistic description of life, the conditions and constraints of prebiotic chemistry, together with bottom-up molecular fabrication and biomolecular nanofabrication and top-down miniaturization approaches to the origin of terrestrial life.

Keywords: biotic raw materials, building blocks of biomolecules, the chemical universe, complex biological matter, self-organization, structure–dynamics–function relations