One goes up... and one goes down. I was a college freshman in Botany 101 when I first learned about xylem and phloem, the two transport tissues which carry water and nutrients up and down a tree's ...
American Journal of Botany, Vol. 88, No. 8 (Aug., 2001), pp. 1331-1339 (9 pages) Phylogenetic analysis provides a rational basis for comparative studies of phloem structure and phloem loading.
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