people in the U. S live in areas that fail to meet national clean air quality standards! A. 1/3
B. 1/2
C. 7 out of 10
D. 20%

Aperson who doesn't have enough calcium in his or her diet is at risk for developing bones that are weak and break easily. this condition is known as  a.  osteoporosis.    b.  crohn's disease.    c.  celiac disease.    d.  hemophilia.

This is a negative reaction to food that doesn’t involve the immune system

Ways in which using health care services effectively can foster your health and ways in which not being aware of them is a health risk.