13. In plant anatomy and morphology, which of the following characteristics is most appropriate for distinguishing between typical monocots and dicots?
(A) The arrangement of vascular bundles in the stem: scattered versus in a ring.
(B) Whether they reproduce by seeds.
(C) Whether they exhibit alternation of generations between sporophyte and gametophyte.
(D) Whether photosynthesis relies on chlorophyll a and b.

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