What do you call this types of environment that you built

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.

Make a prediction about that person’s wellness and justify your prediction using two or more complete sentences.

Which of the following is the definition of ventilation as it relates to the respiratory system?