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*The type of food chosen was the '''independent variable'''.
*The colour of the iodine after being added to food was the '''dependent variable'''.
*There are many '''control variables''' that should be done. If the food colour was blue or black it might give the wrong result, so all the food should be the same pale colour. Another '''control variable''' is the amount of iodine used. Another '''control variable''' is the amount of food used.
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