lhow the life on earth started
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Answer:
Earth is estimated to be about 4.5 billion years old, and for much of that history it has been home to life in one weird form or another.
The earliest evidence for life on Earth comes from fossilized mats of cyanobacteria called stromatolites in Greenland that are about 3.7 billion years old. Ancient as their origins are, these bacteria (which are still around today) are already biologically complex—they have cell walls protecting their protein-producing DNA, so scientists think life must have begun much earlier. In fact, there are hints of life in even more primeval rocks: 4.1-billion-year-old zircons from Western Australia contain high amounts of a form of carbon typically used in biological processes.
But I suggest you watch 'The World's Best documentary' by National Geographic. It has been explained really well