Answer:
Option B.
Explanation:
Cystic fibrosis is caused by a defective gene which causes the lungs and the digestive system to become clogged with sticky mucus resulting the inflammation of the lungs thereby causing difficulty in breathing.
Answer:
That is called metabolism
Use of a spacer should minimize side effects
Answer:
Yes, the diseases of present age are different from those of past. In past, diseases that spread by poor sanitati.
Explanation: