If you didn't know, bark is the outermost layers of stems and roots of woody plants. Bark is a protective layer that helps the plant resist against damage from parasites, herbivorous animals, diseases and other external factors. Tree bark is used for a variety of products such as: spices and flavorings, tanbark for tannin, resin, bark shingle siding and wall coverings, latex, medicines, cork and others. So what are you waiting for? Click start, put the tree bark back together and complete today's challenge. Have fun!