Answer:
doing exercises
Explanation:
these like running use much calories than normal
One function is that they treat and prevent diseases
They also have the function of shutting down business in the case of a medical emergency
Cystic fibrosis affects the cells that produce mucus, sweat, and digestive juices. It causes these fluids to become thick and sticky. They then plug up tubes, ducts, and passageways.
It is an inherited life-threatening disorder that damages the lungs and digestive system.
What don't you understand?
