Answer
d. xylem
Work Step by Step
Tracheids and vessel elements are part of the xylem of plants. Both of these cells die at maturity, forming tubes through which water is transported from the roots to the rest of the plants.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.