I believe that it relates to or involves free oxygen, if it is used in exercise- aerobic practices help improve the the efficiency of the body's cardiovascular system with absorbing and transporting oxygen.
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Swelling is a sign because when you swell up then you know theres something wrong
1.A
2.D
3.D
4.C
5.i thank it is D
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B. Adolescents need more calories and nutrients, especially if they are very inactive.
