You haven't used a comma, so no, it's not correctly used. The comma should be after marathon. Training for the upcoming ten mile marathon, Lizette includes more protein and complex carbohydrates in her diet.
The correctly punctuated sentence is: "To receive the free CD, you must be the tenth caller." This version includes a comma after the introductory phrase for clarity.
This information is usually in the introductory paragraph.
Carbohydrates are in starch, glucose, and sucrose. The "ose" suffix is mostly about carbohydrates.
Carbohydrates are the organic compound class that includes sugars and starches. They are essential nutrients used by the body as a source of energy.
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