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bithcdhsjsjd
10-04-2017
Biology
contestada
what is the structure of a stem
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Аноним
Аноним
10-04-2017
Vascular tissue composed of xylem
(red) and
phloem
tissue (green, between the
xylem
and
cortex
) surrounds the pith. Collenchyma cells are elongated cells with unevenly-thickened walls . They provide structural support, mainly to the stem and leaves.
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