When did simple life begin on earth?

Answer 1

Around 3.8 billion years ago.

Pre-cells developed into the first anaerobic (oxygen-deficient) single-celled bacteria, which remained the predominant life form on Earth for more than a billion years until the first photosynthesizing bacteria evolved. Life originated from early organic compounds that eventually came together to form the first simple "pre-cells".

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Answer 2

Luke Allen

The beginning of simple life on Earth is thought to have occurred between 3.5 and 4 billion years ago.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.