Answer:
They have helical thickening of lignin in their walls to prevent collapse
Explanation:
the primary function of Xylem and its conducting vessels tracheids is to provide support and tranport water and minerals in plants.
Xylem vessels have layers of dead materials in the walls called LIGNIN. Lignin is a polymer; a very strong, hard materials that stop water passage through it,because it contains dead cells,
Therefore the presence of deposit of these strong impermeable, ligified walls in its walls prevent its collapse during mass flow of water of transpiration pull.
Stephen Crane was both a novelist and a C. reporter, although he left that other job and became a full time writer.
Hmm i think it might be a <span>covalent </span>bond
I hope you have a wonderful day! And hope this helps! :D
Answer:A
Explanation:circulatory system functions
