SECTION Power Notes CHAPTER 1 Biology in the 21st Century 1.1 THE STUDY OF LIFE Biosphere: Biodiversity: Species: Organism: Copyright © McDougal Littell/Houghton Mifflin Company. Characteristics Shared by Organisms Details 1. 2. 3. 4. Unit 1 Resource Book McDougal Littell Biology Power Notes 3 SECTION UNIFYING THEMES OF BIOLOGY 1.2 CHAPTER 1 Biology in the 21st Century Power Notes Biology has unifying themes. Systems: Copyright © McDougal Littell/Houghton Mifflin Company. Examples: Structure and function: Examples: Homeostasis: Evolution: Examples: Examples: Unit 1 Resource Book McDougal Littell Biology Power Notes 7 SECTION Power Notes CHAPTER 1 Biology in the 21st Century 1.3 SCIENTIFIC THINKING AND PROCESSES Observing Evaluating results Forming hypotheses Analyzing data Testing hypotheses Copyright © McDougal Littell/Houghton Mifflin Company. Experiment Independent variables Dependent variables Constants Theory: Unit 1 Resource Book McDougal Littell Biology Power Notes 11