Evolution isn’t predictable, and randomness is key in determining how things change. But that’s not the same as saying life evolves by chance. That’s because while the cause of evolution is random (mutations in our genes) the processes of evolution (selection) is not. It’s kind of like playing poker – the hand you receive is random, but the odds of you winning with it aren’t. And like poker, it’s about much more than just what you’re dealt. Outside factors – your friend’s ability to bluff you in your poker game, or changing environmental conditions in the game of life – also come into play. So while evolution isn’t random, it is a game of chance, and given how many species go extinct, it’s one where the house almost always wins.
MORE: http://blogs.scientificamerican.com/science-sushi/2012/01/11/evolution-a-game-of-chance-observations/
