Answer:
A (I think)
Explanation:
Carbohydrates and fats are comprised of carbon, hydrogen and oxygen. Proteins are composed of a chain of amino acids.
Answer:
George Brooks has found that training actually teaches muscle cells how to use lactic acid as a fuel to get more bang for the buck.
Mammogram is the most common diagnostic test for breast cancer.
If you do experimental. You could have 2 different sets of kids (Same age, grade...etc) and give one group sugar such as...lucky charms and do nothing with the other group and see what happens. If you do a survey you're not really getting a full understanding if it changed their attention. I'd use experimental because you can actually observe the behavior
Cardiac glycosides is the answer