In this section we have only examined a few examples of the concept of irreducible complexity. In fact, most organs and systems in living things possess the feature. On the biochemical level in particular, systems function by the working together of a number of independent parts, and cannot by any means be reduced to further simplicity. This fact invalidates Darwinism, which tries to account for the design in life by natural influences. Darwin said that "if it could be demonstrated that any complex organ existed, which could not possibly have been formed by numerous, successive, slight modifications, my theory would absolutely break down." Today, modern biology has revealed countless examples of this. One can only conclude, then, that Darwinism has "absolutely" broken down.