A will be the answer because usually marking your exercise days will become a habit because lets say you would do a running exercise but you want to do it in a certain day well if you mark it on the calendar, it'll become a habit.
C is the answer for this one
Lung diffusion is your ability to pass oxygen into the blood from the air sacs of the lungs, and pass carbon dioxide (CO2) back into the lungs from the blood.
A complete blood count (CBC) test
Explanation:
she will also follow her friends and do whatever they do. teenage thinks that they are the best and they can do whatever to be best infront of others
