1. Introduction. - 1. 1 Functional Biology What is It ?. - 1. 2 The Invertebrates. - 1. 3 The Hiysiological Approach. - 1. 4 Physiology and Fitness. - 1. 5 The Last Word on Genetics. - 2. Acquisition. - 2. 1 Why Feed?. - 2. 2 What is Eaten and How?. - 2. 3 Detailed Consideration of What Should Be Eaten. - 2. 4 How Much to Eat. - 2. 5 Gut Form and Function. - 2. 6 Digestibility. - 2. 7 Movement of Food Through the Gut. - 2. 8 Control. - 3. Respiration. - 3. 1 Molecular Basis. - 3. 2 Oxygen Availability and Uptake. - 3. 3 Levels of Metabolism. - 3. 4 Routine Metabolism and the Effect of Body Size. - 3. 5 Metabolism Associated with Feeding. - 3. 6 Active Metabolism. - 3. 7 Effect of Temperature. - 4. Excretion. - 4. 1 What is It?. - 4. 2 The Excretory System'. - 4. 3 Energy Costs and Benefits. - 4. 4 Secretions. - 5. Growth. - 5. 1 Introduction. - 5. 2 Metabolic Basis. - 5. 3 Distribution of limited and Unlimited Growth. - 5. 4 Cellular Basis. - 5. 5 Adaptational Aspects. - 5. 6 On When to Stop Growing. - 5. 7 Storage as a Special Kind of Growth. - 5. 8 Allometric Growth. - 5. 9 On Growth and Ageing. - 5. 10 On Degrowth and Rejuvenation. - 6. Reproduction. - 6. 1 Introduction. - 6. 2 Sexual Gamete Production Fertilisation and Early Development. - 63 Marine Life-cycles and the Trade-off Between Egg Size and Numbers. - 6. 4 Eggs of Terrestrial and Freshwater Invertebrates. - 6. 5 The Complex Insect Life-cycle. - 6. 6 The Cost of Reproduction For Parental Survival (Iteroparity v. Semelparity). - 6. 7 Reproduction Without Sex. - 7. Integration. - 7. 1 Why the Holistic Approach is Important. - 7. 2 The Energy Budget as an Integrating Equation. - 7. 3 Scope for Growth in Mytilus. - 7. 4 Integration Under Temperature Stress. - 7. 5 Integration Under Food Stress. - 7. 6 Modelling Metabolism. - References. - Glossary of Symbols. - Index of Organisms. Language: English