A tree is a living thing that uses the light from the sun, and the water, minerals and salts contained in the soil to grow.
The tree uses its bark, which has different layers, to transport minerals and water up through the trunk and into the leaves. This is where it gets turned via photosynthysis into sap that is then distributed down the tree and turns into more bark. The leaves also need carbon from the air to do this and this is why a tree is amazing.
A tree can turn an invisible gas into something tangable and able to be seen by us, a bit like quantum physics when we can only measure something by observing it, when we dont observe it is something else completely. If a tree falls in the woods is anyone to hear it? Im not sure because i dont live in the woods at present, I like the comforts of the city. But I do go camping sometimes but my wife will complain also.