The carbon dioxide we exhale as a waste product becomes the life-giving force for a plant; in turn, the oxygen waste of a plant gives us life. This exchange of gas is what the word spirit means. Spirituality is essentially the act of breathing. But the connection doesn’t stop at the exchange of gases in the atmosphere. We are also physically connected, and you can see evidence of this everywhere you look. Think of the protists that live in the hind-gut of the termite, or the fungi that live in the rootstock of trees and plants. The birds that flitter from tree to tree transport fungi spores throughout the environment. Their droppings host a community of insects and microorganisms. When rain falls on the droppings, spores are splashed back up on the tree, creating pockets for life to begin to grow again. This interdependence is an inexorable fact of life.