- 20. Unifying Concepts of Animal Structure and Function
- 21. Nutrition and Digestion
- 22. Gas Exchange
- 23. Circulation
- 24. The Immune System
- 25. Control of Body Temperature and Water Balance
- 26. Hormones and the Endocrine System
- 27. Reproduction and Embryonic Development
- 28. Nervous Systems
- 29. The Senses
- 30. How Animals Move