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Question 1 of 18
Which of the following statements about xylem cells is TRUE?
A. Xylem cells, specifically tracheids, are short and wide with open ends.
B. Vessel elements in xylem are long and tapered.
C. Xylem cells are dead when functional and possess thick, rigid secondary walls with lignin.
D. Xylem cells are alive when functional and have thin, flexible walls.