In the mid 1800's a British naturalist named Charles Darwin published a book named 'The Origin of Species' and said that including human all the living being were not put into the earth by God, rather we evolved from other species. At that time it sounded absurd. But with the time flow when we invented more and more new stuffs then we gradually understood that what Darwin said was right. Overtime every living being is evolving to keep up with the changing environment. If it can evolve then it will survive otherwise nature will make it vanish.