Which statement best summarizes the adaptive value of xylem?
A) Xylem is specialized for transporting food molecules like sugar.
B) Xylem is the reinforcing protein that in combination with cellulose allows plants to grow vertically.
C) Xylem cells open and close to admit carbon dioxide into the leaf during photosynthesis.
D) Xylem is specialized for transporting water and dissolved nutrients.
Correct Answer:
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