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To design an experiment, you must set all other variables constant. These may include the environment, soil type, plant/flower type, water treatment and other essential variables. The only parameter you should vary is the soil temperature.

Answer: By performing scientific experiment

Explanation:

The effect of temperature on variation in flower color can be tested by performing experiment.

The temperature range will be independent variable and the variation in flower color will be dependent variable.

This is how the experiment can be performed in order to see the result the prove the hypothesis.

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