Which layer of earth acts as a very effective “insulator,” because it’s made of rock?

Earlier in the passage this question was provided for, you should be able to find the fallowing text: "The mantle, being made of rock, acts as a very effective insulator."

Mantle

answer; i believe the correct answer is (anemia);

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.