There is an estimate suggests that about 15 billion trees are cut down annually and about 5 billion are planted. The number of trees in the world is 2.96 trillion recorded in 2017. A tree has a woody trunk that is known to be formed by secondary growth, meaning that the trunk of the tree thickens with the passage of time. A tree generally has many secondary branches that are supported by trunk. Trees generally tend to be long-lived, some being a thousand years old. Some believe that trees were independently evolved a woody trunk and branches to get above or tower above other plants to compete for the sunlight. Trees are also known as woody plants, they involve a variety of plant species. The tree is just a plant with an elongated stem, known as a trunk, supporting branches, usually leaves.
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