Which of the following is a lifestyle

a. un-refrigerated food
b. exercise
c. poor sanitation
d. heredity

Is it bad to have a headache all day long?

What kind of wound occurs the skin scrapes against a hard surface and tiny blood vessels break in the outer layer of the skin

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.