Unit 1 –
Chapter 1 why we study life –
Chapter 2 how we learn about life –
Chapter 3 cells: the basic units of life –
Chapter 4 life processes –
Unit 2 –
Chapter 5 heredity and genetics –
Chapter 6 evidence of change –
Chapter 7 mechanisms of evolution –
Chapter 8 classifying and identifying organisms –
Unit 3 –
Chapter 9 viruses and monerans –
Chapter 10 protists and fungi –
Chapter 11 plant life cycles –
Chapter 12 flowering plants –
Unit 4 –
Chapter 13 simple invertebrates –
Chapter 14 complex invertebrates –
Chapter 15 cold-blooded vertebrates –
Chapter 16 warm-blooded vertebrates –
Chapter 17 animal behavior –
Unit 5 –
Chapter 18 support, movement, and protection –
Chapter 19 nutrition and digestion–
Chapter 20 circulation and defense –
Chapter 21 respiration and excretion –
Chapter 22 systems of control –
Chapter 23 the human life cycle –
Chapter 24 maintaining a healthy body –
Unit 6 –
Chapter 25 organisms and their environments –
Chapter 26 ecosystems and biomes –
Chapter 27 humans and the environment.

"It is divided into six units. Each unit begins with a two-page introduction that gives historical background on some of the scientific discoveries or technological achievements related to the unit topic."