I would personally say a Controlled Variable because you are purposefully not spraying the other arm.
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The rate is a mathematical relationship obtained by comparing reaction rate with reactant concentrations.
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All flowering is regulated by the integration of environmental cues into an internal sequence of processes. These processes regulate the ability of plant organs to produce and respond to an array of signals. The numerous regulatory switches permit precise control over the time of flowering.
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remaining still during the night.
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