Studying how drought affects the food supply in a region of the Alaskan tundra would be studying a question at the Level of Ecological Organization.

biosphere

population

community

ecosystem

i am going to guess that it is co2.

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.