The answer is B) Limiting factors.
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Due to the reduction in large industrial emmissions such as fertilizers into water zones.
Answer:
In this, the controlled variables are stirring and type of sugar. As more stirring might elevate the amount of sugar that dissolves, and different kind of sugars might dissolve in distinct concentrations. So, in order to make sure a fair test, there is a need to keep these variables similar for each cup of water.
Explanation:
They are called
a. sunspots
