All of life is about purpose. You breathe air to release carbon dioxide into the air which enables trees to breathe and to provide air for you. True purpose benefits not only at least each other but everyone. Man was made to tend the Earth including the planting of trees (seeds) which in turn provide tremendous benefits (harvests) to not only him but other life as well as. As the image of God, it is the same for us as He has demonstrated.
Purpose
Purpose