From the outside of a tree to its center, which of the following is the correct order of appearance?
1. periderm
2. vascular cambium
3. sapwood
4. secondary phloem
5. cork cambium
6. heartwood
a. 1-2-4-5-6-3
b. 1-5-4-2-3-6
c. 1-4-5-2-6-3
d. 1-3-2-5-4-6
e. 1-2-4-5-3-6
ANSWER: b
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