The following factors affect teenage suicide:
a. alcohol and drug use
c. family relations
b. age and gender
d. all of the above select the best answer from the choices provided a b

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.