The nutrient that is not digested but keeps the digestive system healthy is C. Vitamins :)
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The barriers to exercising are classified as excuses. Excuses like ones physical attributes shouldn't be an excuse to not exercise but a motivator. Time management is another barrier that is classified as an excuse. Even if someone has school or work there is a part of the day that can be used for exercise. Exercising doesn't always have to be an hour in the day.
B. Solid are the state of matter that is made up of particles that build repeating patterns such as the crystalline structure of sodium chloride.
