About This Book
The text explains the principles of biological evolution in clear, nontechnical language, outlining what evolution is and is not and distinguishing the established fact of descent from the debated mechanisms. It presents a branching-descent model from simple to complex forms, using a tree analogy to show divergence and the formation of new species while stressing that one living species does not directly become another contemporary species. It reviews geological and fossil evidence for progressive development, tracing a sequence from single-celled organisms through invertebrates and successive vertebrate groups, and emphasizes extinction as a natural outcome. It also examines the role of natural selection and other processes as explanations offered by scientists.
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