Evolution is simply change from one form to another. Generally, it must by definition tend towards an upward or forward motion. Those new ideas that don't work are weeded out, but those that do continue and prosper. In this way evolution is a good thing for the species, but as you'll see, not always good for the individual. There are different kinds of evolution, insofar as we can group together its various forms into an undetermined number of subgroups based solely on one's perception of the change taking place. The evolution of love or friendship, for example, is perceptibly different than the evolution of the sizes of dinosaur species from the Jurassic Period to the Triassic Period. However, the same general concept of a pattern of change still exists. Now let's take our dinosaur example. At a time there existed the large hulking masses of the sauropods. Food was plentiful, so they could individually support their sizes. They multiply and their species domin...