We often think of trees as simple objects that provide us with things we need, such as
lumber, shade, or fruit. Yet trees are far more complex-and social-than we recognize.
An underground network of fungi, which some have called the "wood-wide web,"
connects the roots of numerous trees in a forest. Using the network, trees can
communicate with and support one another. They may share water, carbon, nutrients,
and protective compounds with one another. Scientists believe that one explanation for
this phenomenon may be a "source-sink model." According to this theory, trees growing
in excellent conditions with many resources transfer these resources to trees growing in
less favorable conditions. In this way, trees in a forest ensure the health of the entire
community by working cooperatively.