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SALSA! Module 2 activities introduce the concepts of adaptation and natural selection and explain how these processes work. The following two activities build on students’ knowledge of heritable genetic variation from Module 1 by showing how selection over time of favorable inherited traits results in the adaptation of populations (although these activities can also be used independently of other modules). Both activities use concrete examples of physical traits being selected upon in a population to illustrate how adaptation works. Post-activity discussion questions provide a way to tie together the themes of natural selection and adaptation with genetics and inheritance of the previous module.

Module 2 reviews the core concepts that define biological evolution (adaptation and natural selection). It provides the link between the transmission of traits by genetic inheritance (Module 1), the role these same traits play in shaping biodiversity (Module 3), and determining how diseases spread (Module 4). The number of activities in this session is reduced to ensure that every participant has the chance to fully comprehend the core concepts that are being discussed.

Module 2: Adaptation and Natural Selection contains two activities:

1. Feeding Darwin’s Finches

2. Survival of the Skittles