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
1, 2, 3 and 4
2 )
1, 2 and 3 only
3 )
1 and 3 only
4 )
2 and 4 only
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