The article "What Good Is a Tree?" in Reader's Digest explained that when the roots of trees touch, there is a substance present that reduces competition. In fact, this unknown fungus helps link roots of different trees--even of dissimilar species. A whole forest may be linked together. If one tree has access to water, another to nutrients, and a third to sunlight, the trees have the means to share with one another. Like trees in a forest, Christians in the church need and support one another.