Trees are able to communicate and defend themselves against attacking insects. Scientists have found that trees can flood their leaves with chemicals called phenolics when the insects begin their raid. They can also signal danger to other trees so they can start their own defense.
The average tree is made up of 99% dead cells. The only living parts are the leaves, root tips, and phloem, which is a thin layer of under bark that acts as a food delivery system.
The entire dandelion plant is edible. Its leaves provide your recommended daily intake of Vitamin K, its flowers can be used to make wine, its root can be used to make a brewed drink that tastes a bit like coffee, and its also used in several soft drinks.