The terms sapwood and heartwood refer to

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Sapwood and heartwood are two different parts of the same tree. Sapwood is the outermost layer of the tree, responsible for transporting water and nutrients from the roots to the leaves. It is lighter in color and less dense than heartwood, which is the darker, innermost part of the tree that provides structural support. As the tree grows and matures, the sapwood in the center of the trunk transforms into heartwood, eventually becoming a central core of dead and decay-resistant tissue.

The Terms Sapwood and Heartwood Refer to