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Part 1 Evolution of animal life: life - general considerations, basic molecules and origins; the cell as the unit of life; genetic base of evolution; evolution of animal diveristy. Part 2 Animal form and function: animal architecture - body organization, support and movement; homeostasis - osmotic regulation, excretion and temperature control; circulation and respiration; immunity; digestion and nutrition; nervous co-ordination - nervous system and sense organs; chemical co-ordination - endocrine system; animal behaviour; reproduction and development. Part 3 The invertrebrate animals: classification and phylogery of animals; the animal-like protista; phylum porifera - sponges; radiate animals - cnidarians and ctenophores; acoelomate animals; molluscs; segmented worms - the annelids; arthropods; lesser protostomes and lophophorates; enhinoderms and lesser deuterostomes. Part 4 The vertebrate animals: vertebrate beginnings - the chordates; fishes; the early tetrapods and modern amphibians; reptiles; birds; mammals.