In cystic fibrosis, a defective gene and its protein product lead to the production of thick and dehydrated mucus because of

Cystic Fibrosis affects an estimated 30,000 children and adults in the United States alone. A person with this disease has thick and dehydrated mucus because it affects the lungs and the digestive system. It clogs the lungs of the people and will lead to life threatening lung infections.It also obstructs the pancreas and this stops the natural enzymes from helping the body to break down foods and to absorb foods. 

Answer : romans built laws to manage the pollution which was lead by smoke produced by the factories.

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.

In fact it is not just nuclear fusion and fission that  can  transform  matter  (or mass)into energy. any time  energy  is produced, some small amount of  matter  or mass isconverted into energy.