Question

describe how life has originated on earth ?

Answer 1

If life evolved in the deep ocean, near a hydrothermal vent, it could have originated as early as 4 to 4.2 billion years ago. If, on the other hand, life originated at the surface of the planet, a common opinion is it could only havedone so between 3.5 and 4 billion years ago...
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Answer 2

Origin of life on earth was explained by experiment conducted by miller and urey. they suggested that the first primitive organisms arised from simple inorganic molecule from chemical synthesize . they assembled an atmosphere similar to early earth containing molecules like ammonia methane and hydrogen sulphide but no oxygen over water . temperature of about 100 c was maintained and sparks were passed to stimulate lightening at the end of the week 15% of carbon had converted into simple compounds including amino acids which make up proteins