Translations:Adventist Youth Honors Answer Book/Health and Science/Digestion/45/en

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Finally, add a drop of iodine to each test tube. The iodine in the cracker/water test tube should turn purple, showing the presence of starch. The iodine in the cracker/saliva test tube should not change color (it should remain brown) showing that the starch has been converted to something else (sugar in this case).

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