In this book, we will be searching for generalities. We can think of these as the logic of evolution or of life, by which we mean the basic premises, properties, or processes, and their relationships to each other and to living forms. An important distinction is between how life does work, and how it might have had to work. Probably no one is really able to answer the latter question. That biology is not too far wrong in its assessment of the logic of life is shown by the fact that we routinely use the principles of evolution successfully to seek genes and understand processes across the entire span of biology. Using these principles allows us to account for a huge diversity of facts with only a modest number of basic units, processes, and principles. That is the goal of any science.
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