Annual rings in a tree trunk result from
A. the alternation of xylem and phloem produced in one year.
B. the proportion of wood cells and cork cells in the xylem.
C. deposition of colored materials in the oldest cells.
D. the kinds of cells, parenchyma or sclerenchyma, produced by the cambium.
E. the variation in cell size due to different growth conditions throughout a year.
Answer: E
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