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Overview: Students learn about variation, reproductive isolation, natural selection, and adaptation through this version of the bird beak activity. Author/Source: UC Museum of Paleontology Grade level: 6-8 Time: One class period Concepts: Evolution results from natural selection acting upon variation within a population Traits that are advantageous often persist in a population. Organisms with similar requirements may compete with one another for limited resources. Individual organisms with advantageous traits are more likely to survive and have offspring. The number of offspring that survive to reproduce successfully is limited by environmental factors. Natural selection is dependent on environmental conditions. Environmental changes affect opportunities and can influence natural selection. A hallmark of science is exposing ideas to testing. There is variation within a population. Teacher background: Adaptation Natural Selection

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