Water, H₂O, is made up of different elements, hydrogen and oxygen. Is this type of combination a mixture or a pure substance?

Answer Options:

• A. Because water is composed of two separate elements, it is a mixture.
• B. Because water can be heated and fairly easily turned to steam, it is a mixture.
• C. Because water is composed of elements found in the periodic table, it is a pure substance.
• D. Because water molecules all have a consistent ratio of hydrogen to oxygen, it is a pure substance.

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