Answer:
Excess carbohydrates and fats are stored; excess proteins are not
Explanation:
There are many differences between proteins, carbohydrates and fats. They are each made of their own specific monomers. For example, proteins are made up of amino acids, fats are made up of fatty acids, and carbohydrates are made up of monosaccharides.
Carbohydrates can be macromolecules, one example is starch.
Carbohydrates, fats and proteins all contain carbon, hydrogen and oxygen. The only major difference is that proteins also contain nitrogen and can also contain small amounts of sulphur.
Hence, the answer is the last option, because where carbohydrates can be stored as starch or glycogen, and fats can be stored as fat cells, proteins cannot be stored and they are usually excreted as ammonia or urea.
