From your observations in Electrostatics I, what evidence is there for the existence of at least two varieties of charge? Have you seen anything that shows that a third type of charge exists?

colorectal cancer may also develop from areas of abnormal cells in the lining of the colon or rectum. this area of abnormal cells is called dysplasia and is more commonly seen in people with certain inflammatory diseases of the bowel such as crohn's disease or ulcerative colitis.

the force on the thing and the distance the force moves the thing