Which system is made up of the fluids and cells that help protect the body against infection?
O the endocrine system
O the integumentary system
O the circulatory system
O the lymphatic system

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.