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Part 1 Introduction to the living animal: life - biological principles and the science of zoology; chemistry of life; origin of life; the cell as the unit of life; physiology of the cell. Part 2 Continuity and evolution of animal life: the reproductive process; principles of development; the principles of genetics - a review; organic evolution. Part 3 The diversity of animal life: architectural pattern of an animal; classification and phylogeny of animals; the animal-like protista; the mesozoa and parazoa; the radiate animals; the acoelomate animals; the pseudocoelomate animals; the mollusca; the segmented worms; the arthropods; the aquatic mandibulates; the terrestrial mandibulates; the lesser protostomes; the lophophorate animals; the echinoderms; chaetognaths and hemichordates; the chordates; the fishes; the early tetrapods and modern amphibians; the reptiles; the birds; the mammals. Part 4 Activity of life: support, protection and movement; homeostasis; internal fluids; digestion and nutrition; nervous coordination; chemical coordination; animal behaviour. Part 5 The animal and its environment: the biosphere and animal distribution; animal ecology.