What causes rickets?
lack of calcium
lack of vitamin c
lack of adequate sunlight

Write a paragraph about why the respiratory system is important and we need to breathe easily. (guys i really need ) x(

What ingredients used in tobacco products been banned?

What should you not do when doing abdominal workouts? a. keep your chin off your chest b. keep your head aligned with the spine c. put pressure on your neck d. all of the above