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Complex carbohydrates:​ are long chains of sugar units arranged to form starch or fiber. ​are known as the monosaccharides and disaccharides. ​are small molecules containing six carbon atoms. ​contain calcium, hydrogen, and nitrogen. include both single sugar units and linked pairs of sugar units.

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Answer:

Are long chains of sugar units arranged to form starch or fiber.

Explanation:

The carbohydrates are compounds formed by carbon (C), hydrogen (H) and oxygen (O), and they are composed for single or multiple sugars. When composed by a single sugar (as glucose) it's called a simple carbohydrate, or monosaccharide. When it's composed of two units of sugar, it's called a disaccharide.

The carbohydrates that are composed of a long chain of sugar units are called polysaccharides, or complex carbohydrates, and they are the complex sugars used as energy reservations or as structural, so they from starch or fiber.

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