Answer:
it's hard for people to concentrate because they always have that one person on there mind and there always thinking about them so they get so distracted with that .
The correct answer is option D. Calcium.
Low bone density can be due to a lack of calcium thus requiring supplementation.
The answer is fats. You need protiens and water. Carbonhydrates are things like suger and starch. Carbonhydrates are your bodys main sorce of energy in a heathy balenced diet.
Answer:
The blood picks up co2 and also waste from the tissue. So I am guessing that it is co2.
Hope this helps.
