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Overview: Through a series of fictionalized diary entries, this case recounts the 1939 discovery by Marjorie Courtenay-Latimer (and identification by J.L.B. Smith) of a living coelacanth, a fish believed to have been extinct for 70 million years. Author/Source: Grant, Robert Grade level: 9-12 Time: 50-90 min. Concepts: Biological evolution accounts for diversity over long periods of time. An organism’s features reflect its evolutionary history. There are similarities and differences among fossils and living organisms. Similarities among existing organisms provide evidence for evolution. Anatomical similarities of living things reflect common ancestry. Random factors can affect the survival of individuals and of populations. A hallmark of science is exposing ideas to testing. Our knowledge of the evolution of living things is always being refined as we gather more evidence. Classification is based on evolutionary relationships. Teacher background: Nature of Science History of Life

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