As secondary growth proceeds in a tree,the th | vedclass

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(A) As secondary growth proceeds in a tree,the vascular cambium produces secondary xylem towards the inner side. Over time,the older secondary xylem n

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Heartwood

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(A) As secondary growth proceeds in a tree,the vascular cambium produces secondary xylem towards the inner side. Over time,the older secondary xylem near the center of the stem becomes non-functional and is filled with tannins,resins,and oils,forming the heartwood. The peripheral,functional part of the secondary xylem is called sapwood. As the tree ages,the amount of heartwood increases because more secondary xylem is converted into heartwood,while the sapwood layer remains relatively constant in thickness to maintain water conduction.

As secondary growth proceeds in a tree,the thickness of which of the following increases?

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