<span>-Carbohydrates. Carbohydrates are comprised of carbon (C), hydrogen (H), and oxygen (O) molecules.
-Proteins. Proteins are comprised of amino acids.
-Lipids. A wide variety of biomolecules including fats, oils, waxes and steroid hormones.
<span>-Nucleic Acids.</span></span>
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66% of new HIV infections occur in sub-saharan Africa.