Answer:
cortex
Step-by-step explanation:
Cambium
The vascular cambium produces secondary xylem on the inside of the ring, and secondary phloem on the outside, pushing the primary xylem and phloem apart.
Phloem and Xylem
vascular bundles, each containing both xylem and phloem.
Cortex
The region of cells in the stem is called the cortex