* Astronomy

There is only one figure in On the Origin of Species, and that is a tree diagram. As Darwin’s model for the theory of evolution, he used the Tree of Life (TOL) to clearly and visually explain the interrelatedness of all living things, implying that from one common ancestor (the root) sprung branches, which produced smaller offshoots as genetic progeny, etc.
In this model, similarities between species reveal a common ancestor, and differences result from (and explain) Darwin’s main catalysts: competition and natural selection, which generate improvement in future generations. As a simile, the TOL served a vital purpose for introducing the theory of evolution to the community in an understandable way. Although there is no external evidence to support the idea that evolution is inclusively hierarchical, many evolutionists believe the TOL provides an accurate general representation of the history of life, which could potentially be completely reconstructed by knowing the relevant data.



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Charles Darwin could have saved himself from some of his first critics if he had remembered to include his preface in the first edition of his influential book on evolution and natural selection, "The Origin of Species."
The original edition of the landmark book was published in 1859, without any introductory material. Still a public flash point today, "Origin" drew initial outcries, in part for the missing preface in which an author of the time typically would have credited and thanked his intellectual predecessors. One scientist accused Darwin of plagiarism for failing to acknowledge the giants whose work allowed him to see farther.

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