| http://www.w3.org/ns/prov#value | - Sieve-tube members lack such organs as nuclei or ribosomes, but cells next to them, the companion cells, function to keep the sieve-tube members alive.The movement of nutrients, water and sugars is affected by transpiration, conduction and absorption of water.The most abundant compound in all plants, as in all life, is water which serves an important role in the various processes taking place.
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