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Overview: Students learn the differences between "gradualism" and "punctuated equilibrium" by manipulating two sets of simulated fossils (Caminalcules). Author/Source: McComas, William Grade level: 9-12 Time: 1-2 class periods. Concepts: Correspondence to the Next Generation Science Standards is indicated in parentheses after each relevant concept. See our conceptual framework for details. Background extinctions are a normal occurrence. Rates of extinction vary. The fossil record provides evidence for evolution. The fossil record documents patterns of extinction and the appearance of new forms. Rates of evolution vary. Teacher background: Speciation

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