What is the layer between xylem and phloem called?

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Multiple Choice

What is the layer between xylem and phloem called?

Explanation:
The vascular cambium. This thin layer of meristematic tissue sits between the xylem (inside) and phloem (outside) in many vascular plants. Its job is to divide and produce secondary xylem toward the inside and secondary phloem toward the outside, driving the thickening of stems and roots (secondary growth). Cortex lies outside the vascular tissues, and xylem and phloem are the tissues themselves, not the layer between them.

The vascular cambium. This thin layer of meristematic tissue sits between the xylem (inside) and phloem (outside) in many vascular plants. Its job is to divide and produce secondary xylem toward the inside and secondary phloem toward the outside, driving the thickening of stems and roots (secondary growth). Cortex lies outside the vascular tissues, and xylem and phloem are the tissues themselves, not the layer between them.

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