The garou consider themselves to be the immune system of Gaia and in a way they are a part of it. Those are cells that hunt down and devour infections. Well, that's an indelicate but apt analogy. Umm, you lost me there I think. And this energy is cycled through the wyld and made into people and things.
Biological system are no exceptions.
All of them. The nodes and ley lines of this world act as the meridians of the human body. There is a natural renewable cycle to Gaia as any Garou will happilly tell you. Sam became very serious. Rueben's eyes got very big.