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Auxin.
Auxin<span> is a plant hormone produced in the stem tip that promotes cell elongation. </span>Auxin<span> moves to the darker side of the plant, causing the cells there to grow larger than corresponding cells on the lighter side of the plant.
source: </span>https://www2.estrellamountain.edu/faculty/farabee/biobk/BioBookPLANTHORM.html
<span>Hydroelectric power does not require moving water as dams hold water back. False. </span>
