A. think of the Atikins diet which alows for no carbs. That is something that would be hard to stick to
The "BEST" answer for this question is:
* (B. 4 to 5 <------:)
Explanation:
Decrease level of calcium in the blood is the correct answer
3: immune system
4: antigens
1: not sure but maybe T-cell
2: how germs get inside our bodies
