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Secondary Phloem
The part of a plant's vascular system that transports nutrients and is formed after the primary growth phase.
Cork
Outer covering of the bark of trees; made of dead cells that may be sloughed off.
Sieve-Tube Members
Specialized elongated cells in the phloem of vascular plants, which transport sugars and other organic nutrients.
Vascular Cambium
A layer of actively dividing cells in plants that produces secondary xylem (wood) and phloem, contributing to the thickness of stems and roots.
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