An organism (You're one.) is a system. As is a family, a society, or a population. Donella Meadows does a wonderful job helping us look at things and their behaviors as systems, as opposed to linear, A causes B-type explanations. Highly recommended.
Libraries store the energy that fuels the imagination. They open up windows to the world and inspire us to explore and achieve, and contribute to improving our quality of life. Libraries change lives for the better.