Question

carbohydrates consist of carbon, hydrogen, and ____. lipids, including fats and oils, predominantly consist of carbon, hydrogen, and ____.

Explanation:

For the first blank (carbohydrates): Carbohydrates have the general formula \( C_n(H_2O)_m \), so they consist of carbon, hydrogen, and oxygen.
For the second blank (lipids): Lipids are organic compounds that mainly consist of carbon, hydrogen, and oxygen (though some lipids may have other elements in small amounts, the primary ones are C, H, O).

Answer:

First blank: oxygen
Second blank: oxygen