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HOW A TREE GROWS
Roots
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The roots of a tree are below the ground.
As a tree grows, its roots expand into soil. The roots grow at the very tips, expanding into new soil. In this way, the roots are very similar to the twigs!
It's necessary for roots to expand because as a tree gets older and
bigger, it needs more nutrients and water. The only way to get more
is to expand roots into new soil!
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