This outstanding book has been fully revised to feature: - additional information on topics such as clinical trials, B and T lymphocytes, infertility, performance-enhancing hormones, fluoridation of water supplies, impact of hunting and over-fishing, global warming, biofuels and global travel and disease - a new chapter on Applied Genetics, drawing together and expanding the information on selective breeding, genetic engineering, cloning, genetic fingerprinting and the Human Genome Project.