2.3 Carbon Compounds Key Questions: What elements does carbon bond with to make up life's molecules? Hydrogen, Oxygen, Phosphorus, Sulfur, Nitrogen What are the functions of each of the four groups of macromolecules? Living things use carbohydrates as their main source of energy. Plants, some animals, and other organisms also use carbohydrates for structural purposes. Lipids can be used to store energy. Some lipids are important parts of biological membranes and waterprood coverings…
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