ORIGIN OF LIFE
ORIGIN OF LIFE. EARTH’S EARLY ATMOSPHERE. 4.6 Billion Years Old Geologic evidence shows Earth formed 4.6 BYA Early Atmosphere Probably contained CO 2 , CO, Nitrogen, Ammonia, Methane But, No Oxygen! (wouldn’t support life) 3.8 BYA Earth cooled enough for liquid water to form.
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