How many years ago and in which environment life originate on the earth?

3.5 million years and reducing environment

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3.5 billion years and reducing environment

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4.5 million years and reducing environment

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4.5 billion years and reducing environment

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Solution

The correct option is B 3.5 billion years and reducing environment
The scientists have found that simple unicellular organisms (resembling modern Cyanobacteria) were present on this earth about 3600 million years ago. It is believed therefore that life must have originated on this earth about 3.5 billion years ago.
It must be clear that the earth's atmosphere at that time was quite different from as it exists today. The earth's atmosphere at that time was reducing, and not oxidizing (as it is today). The primitive atmosphere of earth had hydrogen, nitrogen, water vapours, carbon dioxide, methane and ammonia abundance. Oxygen was not available in free state in sufficient quantities.
So, the correct answer is '3.5 billion years and reducing environment'

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