Which tree was used by the ancient Greeks to treat asthma and coughs? Why do leaves turn orange and gold during autumn? How do trees defend their neighbors against predators in the forest? When is a tree not a tree? Trees, an Explore Your World™ handbook, incorporates the Discovery Channel's unique authoritative approach and acclaimed visuals to answer these and other questions in a captivating blend of information and entertainment.Trees features:Background information on the evolution of trees, from the origins of sea plants over 400 million years ago to the existence of a quarter million tree species today.A detailed look at how the mechanism of roots, the workings of the leaf and the functions of the trunk all contribute to a tree's development.An examination of the ways trees have enhanced human life, as the source of the foods and materials we depend on for our survival.Practical advice on examining buds, bark, and leaves, and choosing the appropriate tools for exploration.An identification guide to more than 160 various species and subspecies, along with a map of the major ecological communities of the world.More than 300 full-color photos and illustrations. Read Less