If your choose to smoke, your body will use this substance less effectively. A) microorganisms B) carbon dioxide C) plasma D) oxygen

Explanation:

the answer is D, oxygen. because of the duration of smoking habit, try to run up a flight of stairs..you will soon find you have a hard time catching your breath, even stopping 2 do this..

      x/140 = 25/100

we need to find the x to find the x multiply 140 and 25

and what do you get 3500.   and what is 3500 divided by 100

= 35

i think it's the first one because doctors aren't the ones who get rid of the old needles. most of them time it's not even doctors who give you shots, it's nurses.