Communicable diseases are said to be
A. contagious or infectious
B. bacteria or viruses
C. macrophages or neutrophils

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.

The outermost layer of your teeth is called the enamel and is made of?

Diagram the passage of food through the digestive system. label the organs involved in digestion and absorption and identify the sites where carbohydrates, proteins, and fats are digested.