The text book version of Darwinism is said to be the descending from a common ancestor. However, in all honesty is is nothing more than a mutation (which are random on a microscopic level). More complex species evolve into simpler ones. There is also a need for species struggle, competition, and the manifest of reproductive success.
Branching off from Darwinism is the idea of natural selection. Again the text book version of the term is: it is the process by which favorable heritable traits become more common in successive generations of a population of reproducing organisms, and unfavorable heritable traits become less common. Additionally, as we have discussed in class: Natural Selection was key to Charles's understanding of the process of natural selection. Darwin realized that the most fit individuals in a population are the ones that are least likely to die of starvation and, therefore, are most likely to pass on their traits to the next generation.
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