Can you guess how life arrived on Earth? 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
Really some scientists think life appeared the moment our planet’s environment was stable enough to support it.
First proof of 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. [7 Theories on the Origin of Life]
But despite knowing approximately when life first appeared on Earth, scientists are still far from answering how it appeared. The development of living beings on earth again has its own history. Is it really true that human beings came from forest man?
What they eat in those days? how they survived? Hunting and fishing technology has totally changed now. The way how people catch fish in old days is different in these days. Here is a video showing how people catch fish in old days for their survival.