A leaf transforms the elements of its environment—sunlight, carbon dioxide, rain—into nourishment for its tree. This beautiful, nearly weightless, ephemeral piece of nature is a vital conduit to the branch that is a conduit to the trunk that is a conduit to the roots of the tree. The roots, in turn, draw nourishment from the earth to feed the trunk, the branches, and the leaves. The living beings that inhale the oxygen that comes from this process exhale the carbon dioxide that feeds the leaves through which the tree is fed. It is difficult to know where one cycle ends and another one begins.
One of the many gifts that nature offers us is a clear demonstration
of the interdependence between all living things. The person who exhales
the carbon dioxide, the clouds that produce the rain, the sun that
gives light, the leaf that transforms all these things into sustenance
for a tree—not one of these could survive without being part of this
cycle. (Daily OM)