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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