It s pre-planned, so everything is etched in stone just waiting to happen. Organisms are forced to survive with the features given to them. Everyone has there own special contributions to life as a whole. Not one thing is the same as the other. Everything has properties that are not identical to anything else.
Life is variety.
There are many theories that people come up with over time about the origin of life. I believe in spontaneous generation. This states that living things originated from non-living matter. Charles theorized that life commenced by a warm little pond where deep inside organic chemicals were stirring. I believe that this could have one day, promoted the first simple organisms.