Adrug in tobacco that increases the action of the central nervous system

True or false mucous membranes destroy pathogens on the outer body surface, at body openings.

The structure shared between the male reproductive system is the

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.