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Answer:
1.Ethyl alcohol is used as a solvent, in the synthesis of other organic chemicals, and as an additive to automotive gasoline (forming a mixture known as a gasohol).
2.Iodine may be used as an indicator to follow the changes of iodide ion and iodine element.
3.Variegated leaves have green parts (where the cells contain chlorophyll) and white parts (where there is no chlorophyll).Only the parts that were green become blue/black with iodine solution, showing the importance of chlorophyll in photosynthesis.This is evidence that chlorophyll is required for photosynthesis.
4.People need plants to live. When green plants make food, they give off oxygen. This is a gas that all animals must breathe in order to stay alive. Without plants, animals would have no oxygen to breathe and would die.
Explanation:
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