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a) R - Sieve pore
S - Cytoplasmic strands, cytoplasmic filaments
Cell labeled T - Companion cells
b) Translocation - Its contractile is nature to push food/ organic products of photosynthesis from one sieve cell to the next
c) It is thickened or lignified to keep vessels strong and open.
johnmulu answered the question on May 2, 2017 at 09:14
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