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A metabolically important difference between proteins and carbohydrates and fats is that:
a. proteins contain carbon whereas carbohydrates and fats do not
b. proteins contain a lot more energy per gram than both carbohydrates and fats
c. proteins contain nitrogen whereas carbohydrates and fats do not
d. proteins are made of smaller building blocks whereas carbohydrates and fats are not

Respuesta :

th answer is D its the best answer that fits the question . 

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