What is the main sources of human body

Humans obtain energy from three classes of fuel molecules: carbohydrates, lipids, and proteins.

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Explanation:

answer; hypnagogic sensations)

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products