• 14 Mass flow is the bulk movement of materials from one place to another. Which vessels carry fluids by mass flow? 1 artery 2 phloem sieve tube 3 vein 4 xylem vessel A 1, 2, 3 and 4 B 1, 2 and 3 only C 1 and 3 only D 2 and 4 only


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