Evolution, Does It Makes Sense? For hundreds of years the topic of how we got here today has been questioned, and formed into different theories that tell the history of life. The theory of evolution is the most thought out and elaborate way to look at how life started as only single celled organisms and evolved into many very complex species. Evolution is said to have started on a prehistoric earth after it had formed over 4.6 billion years ago. It took about a billion years after Earth was formed just for the first very simple single cell prokaryotes to appear, and it would take 3 billion more years before the most simple animals would appear. So this theory doesn’t show life coming into existence overnight, like a creationist theory tries
