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This is a lesson about the requirements for life on another planet. Learners will grow organisms in one of 12 classroom environments and identify common requirements (such as water, nutrients, and energy). They will also design a mission to identify habitable places by searching for water, nutrients, and energy. A math extension explores measuring calories. This is activity 2 of 5 in "Astrobiology in your Classroom: Life on Earth..and Elsewhere?"