Check all the characteristics below that describe elements. one type of atom

a pure substance

more than one type of atom

chemically combined elements
An oligarchy is best defined as

one type of atom

a pure substance

Explanation:

image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.