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Overview: Students compare different subspecies of a California salamander on a grid map of California to focus on patterns of their distribution, their likely evolutionary relationships, and probable sequence of formation from the ancestral salamander. Author/Source: ENSI Grade level: 9-12 Time: Two 50-minute periods Concepts: Speciation is the splitting of one ancestral lineage into two or more descendent lineages. Speciation requires reproductive isolation. Occupying new environments can provide new selection pressures and new opportunities, leading to speciation. A hallmark of science is exposing ideas to testing. Scientists can test ideas about events and processes long past, very distant, and not directly observable. Teacher background: Speciation Evidence for Evolution

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