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Trees are not a monophyletic taxonomic group but consist of a wide variety of plant species that have independently evolved a trunk and branches as a way to tower above other plants to compete for sunlight. The majority of tree species are angiosperms or hardwoods; of the rest, many are gymnosperms or softwoods. There are few organisms as important as trees for maintaining Earth’s ecology. This article discusses the historical, popular, and botanical classifications of trees, their evolution, their importance to humans, and their general structure and patterns of growth. Trees are plants, which look bigger with lots of branches and leaves. There is no proper scientific definition of tress. In general, a plant is considered a tree if its height reaches more than 13 feet, lives for many years, and has a woody stem. Moreover, there are certain features which are common in trees. These features are: As you know, there are many different tree species. However, they all share some key features that meet the criteria for what we understand to be a tree. Here's our simple definition: A tree is a tall plant that can live a very long time. It has a single stem or trunk and branches that support leaves.

As vascular plants, trees are organized into three major organs: the roots, the stems, and the leaves. The leaves are the principal photosynthetic organs of most higher vascular plants.