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What refers to the metabolic process of building up larger molecules from smaller ones?

  1. Catabolism

  2. Circulatory

  3. Anabolism

  4. Excretory

The correct answer is: Catabolism

The correct answer is A. Catabolism. Catabolism refers to the metabolic process of breaking down larger molecules into smaller ones to release energy. This is the opposite of anabolism, which refers to the metabolic process of building up larger molecules from smaller ones, as mentioned in the question. Circulatory and Excretory are not directly related to the metabolic process of building up or breaking down molecules in the body.