Which of the following can best be described as en element or compound that cannot be physically separated?

C because a mixture is still separated but are just in the same vicinity and heterogeneous is hetero meaning different and matter is what makes up all things and can be separated.

well we can't tell you because we cant see the time give a screen shot or something.

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.