Is a group of diseases characterized by uncontrolled growth and spread of abnormal cells in the body, and can be caused by both internal and external factors. a. cancer b. heart disease c. diabetes d. osteoperosis

Christopher came down with chicken pox after spending time in his child’s day care. the chicken pox represents what link in the chain of transmission in this scenario?

per vehicle mile, motorcyclists are times more likely to die in a crash than passenger car occupants.

Which of the following statements concerning cancer and mutations is correct? a: cancer can only occur with a mutation in a somatic cell. b: usually, multiple mutations are required in different genes to cause cancer. c: none of the other answer options is correct. d: cancer can only occur with a mutation in a germ cell. e: usually, a single mutation is all that is required to cause cancer.