Big trucks and all motor generated machines or automobile vehicles are the major cause for air pollution. Smoke coming from the pipes that go down to the engine and come up through the pipes burst into he air, making air unhealthy and more dangerous in the big cities.
A very small portion of colorectal cancers are caused by inherited gene mutations. Many of these DNA changes and their effects on the growth of cells are now known. For example: Familial adenomatous polyposis (FAP), attenuated FAP (AFAP), and Gardner syndrome are caused by inherited changes in the APC gene.
