Monarch Butterflies Inside the Chrysalis (Back to Lesson) National Science Education Standards Life Science Each plant or animal has different structures that serve different functions in growth, survival, reproduction. (K-4) Living systems at all levels of organization demonstrate the complementary nature of structure and function. (5-8) History and Nature of Science Many people choose science as a career and devote their entire lives to studying it. Many people derive great pleasure from doing science. (K-4)

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