___ help the flow of blood from atrium to ventricle. HELPPP

the answer for apex is "1 and 6"

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.

blue

light-years

magnitude