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A student hypothesizes that a goldfish will be more active in a bowl that has red gravel than in a bowl with grey gravel. To test this hypothesis, the student places on goldfish in a bowl with red gravel and another in a bowl with grey gravel. The color of the gravel is the blank variable in the experiment.

A. Control
B. Responding
C. Dependent
D. Independent

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satsukolovesyou
I believe that the answer is B responding, due to the fact that it’s testing the response of the fish to each gravel

Answer: D. Independent

Explanation:

The independent variable is the variable which is used in an experimental setup. It can be changed or manipulated and even altered so as to determine it's effect over the dependent variable. The dependent variable changes due to the changes in the independent variable.

The color of the gravel is the independent variable. The effect of which is to be observed on the dependent variable that is the activeness of the goldfish.    

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