This chapter discusses current biodiversity crises including why we should care, the root causes, and how to preserve species and prevent extinctions. Chapter 30 Protists. This chapter was thoroughly updated to better reflect modern concepts regarding protist diversity. Chapter 37 Nutrition and Transport in Plants. This chapter begins with a new section that includes a discussion of soil formation and its nutritional functions.
New figures support an improved discussion of xylem and phloem transport.
The majority of illustrations in this chapter are new and most of the others have been revised. Chapter 46 Neurons and Nervous Systems. The chapter has been reorganized and rewritten for better flow. The more thorough discussion of the central nervous system includes a new section on learning and memory. Chapter 49 Hormones and Endocrine Systems.