Many forests around the world tend to have trees that grow to the same height. The top level known as the canopy is produced for two reasons. One, trees must absorb an immense amount of solar energy to stay alive, so if they could not reach the top to collect sunlight, they would die. When a large tree dies, sunlight can reach the forest floor, allowing a new one to grow in its place. Secondly, many forests and trees grew up together. Whether two smaller trees took the place of a bigger one or a volcano leveled a forest and a new one grew in its place, many plants grow together.
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