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Trees
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These tall, seed-producing plants have a single woody stem, called a trunk, which supports their great weight. They live for many years and do not die in winter. The largest group of trees is broad-leaved trees.

Why Are Trees So Important?
Trees release oxygen into the atmosphere for other organisms to breathe in. The roots of trees bind soil together, preventing it from being washed away. Trees also provide food and habitats for many animals, and wood for fuel, lumber, and many other products.

How Do Trees Grow?
Trees grow in two ways. Special cells at the tips of twigs divide, making the twigs grow. Also, a layer of cells under the bark, the cambium, divides, widening the trunk and branches. The new cells that the cambium makes form a visible ring inside the trunk.

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