A Scientist wonders if the amount of Vitamin C that he feeds to rats will have any affect on the rats' mass. He measured both the mass of the rats and the amount of Vitamin C in grams. Identify the controlled variable.
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the controlled variable will be the mass of vitamin C the scientist has to give the rats

emerald ash borer

the emerald ash borer is a green buprestid or jewel beetle native to north-eastern asia that feeds on ash species. females lay eggs in bark crevices on ash trees, and larvae feed underneath the bark of ash trees to emerge as adults in one to two years. hope this !

the sphincter muscles at the end of the digestive tract is the anus.