Biology
They play key roles in the contraction of muscles,digestion of food and clotting of blood.

Fats
Proteins
Carbohydrates
Vitamins

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Biology
Which of the following statements is not true about metabolism?

Younger people generally have a slower metabolism than adults
Metabolism is influenced by numerous factors, such as heredity and age
Basal metabolism is measured by the amount of calories burned when your body is inactive
Basal metabolism is the amount of energy needed for sustaining life

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