Which of the following is not a kind of air mass found in the united states
a maritime tropical
b continental polar
c polar tropical
d maritime polar

answer; /// i believe that the correct answer is (50%);

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.