In lateral growth, the _____ is the source of new xylem and phloem, whereas the _____ renews and maintains the outer layer that protects the stem.
A) cork cambium; vascular cambium
B) vascular cambium; cork cambium
C) secondary vascular tissue; primary vascular tissue
D) sapwood; heartwood
E) apical meristem; lateral meristem
Correct Answer:
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