What is the two most important aspects of defense?

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.

Which action best increases one’s stamina a) exercising when you feel like it b) saving so much that one like sleep c) refusing to exercise to save the energy needed to work d)exercising on a regular basis

Which is a personal reason for using tobacco