Origins of Life Chemosynthesis

things. There was no flora, no fauna; the Earth was completely barren of life. Instead of having an atmosphere rich in nitrogen and oxygen as it is today, the atmosphere on primitive Earth was composed primarily of methane, ammonia, hydrogen gas and water vapor. The lack of a protective ozone layer resulted inhigh exposure to UV light and radiation. Earth was also extremely volcanically active in the past and was continuously outgassing chemicals into the atmosphere. Even the oceans of Earth were a ‘primordial soup’ of chemicals such as ammonia, phosphae, nitrogen and carbon. Generally, the world was not a hospitable place back then, at least not according to human standards.