It allows Nutrients and waste substances to pass through them
Trouble breathing is the right answer :)
They are all used for energy, etc.
Hope this helps.
Answer:
40 and 60 minutes per dey
Explanation:
They recommend that overweight and obese people who wish to lose weight should exercise between 200 and 300 minutes per week, to lose about 2000 kcal per week.
So, if they exercise Monday through Friday, they should do about 40 to 60 minutes daily.
