The Trembling Aspen in its Autumn

A tree is a tall plant with a trunk and branches made of wood. Trees can live for many years the oldest tree ever discovered is approximately 5000 years old. The four main parts of a tree are roots, the trunk, the branches and the leaves.
The roots of a tree are usually under the ground. One case for which this is not true are the roots of the moangrove tree has many roots. The roots carry food and water from the ground through the trunk and branches into the leaves of the tree. They can also breath air. Sometimes roots are specialized into aerials roots which can also provide support as is the case with the banyan tree
The trunk is the main body of the trees trunk is covered with bark which protects it from damage. Branches grow from them they spread out so that the leaves can get more sunlight.
The leaves of a tree are green most of the time but they can come in many colours shapes and sizes. The leaves take in sunlight and use water and food from the roots to make the tree grow, and to reproduce. Trees and shrubs take in water and carbon dioxide and give out oxygen with sunlight to form sugars. This is the opposite of what animals do in respiration. Plants also do some reputation using oxygen the way animals do. They need oxygen as well as carbon dioxide to live.