The "backbones" of the macromolecules of life made of what element?

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The macromolecules of life, such as carbohydrates, lipids, proteins, and nucleic acids, are all composed of carbon atoms that form the backbone of the molecule. This is why carbon is often referred to as the "building block of life." While nitrogen and oxygen do play important roles in some macromolecules (such as nitrogen in amino acids and oxygen in nucleic acids), they are not the primary element in the backbone of these molecules.

The "Backbones" of the Macromolecules of Life Made of What