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1 What Is an Organism? Vocabulary Concepts and Skills habitat the place where an organism lives • Students distinguish living things from nonliving things. organism a living thing • Students identify the needs of living things. • Students name examples of organisms. • Students classify objects as living, nonliving, or once-living. Inquiry Focus Classify When students classify, they sort objects, events, or organisms into groups to show how they are alike. Learn by Reading For additional content area reading, see the Houghton Mifflin Science eBook: Grade 1, Unit B, pages B8–B11. Planning Materials Student Resources • *live animals such as goldfish • 1.1 Vocabulary • *live plants • 1.2 Organisms • *small plastic or rubber replicas of organisms • 1.3 Living or Nonliving? • 1.4 Section 1 Assessment • plastic trays • *nonliving objects, such as erasers, rocks, and plastic animals *Not provided in kit In Advance • For Investigate 1 (p. 4) and Section 1 Assessment (p. 7): Ask students to bring in small plastic replicas of a wide variety of living things, such as earthworms, insects, spiders, snakes, frogs, fish, birds, and various mammals. (Do not use replicas of dinosaurs for these activities.) 2 • EXPERIENCE SCIENCE Science Background Organisms The word organism refers to any living thing, whether it is a bacterium, protist, fungus, plant, or animal. No matter their size or the complexity or simplicity of their body structures, all organisms share certain characteristics. All organisms... • are made of one or more cells. • respond to stimuli and react to changes in their environment. • grow and develop. • produce offspring like themselves based on information in their DNA. • have feedback processes that regulate their activities and keep them stable. • have certain basic needs, including water and nutrients. These common characteristics distinguish living things from nonliving things. SECTION 1 WHAT IS AN ORGANISM? • 3