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To test the efficacy of vitamin C in preventing colds, army recruits are randomly assigned to one of two groups: one in which 500 mg of vitamin C is administered daily, and one in which 500 mg of a placebo is administered daily. Both groups are followed to determine the number and severity of subsequent colds. Which of the following study designs most appropriately characterizes this situation?
Limestone
A sedimentary rock composed primarily of calcium carbonate, often formed from marine organisms' shells and skeletons.
Granite
A rough-textured igneous rock that predominantly contains quartz, feldspar, and mica, frequently used in the construction industry.
Lineation
A linear feature within rock, such as grain elongation or mineral stretching, that indicates flow or movement directions during formation.
Elongated Mineral
A mineral shape characterized by being significantly longer in one direction than in the others, common in some types of crystals.
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