Question

Environmental and lifestyle factors contribute to somatic mutations. Which of the following is a lifestyle factor?
A. Contaminated water
B. Lead paint
C. Nuclear radiation
D. Smoking tobacco

Answer 1

@Frostbite

Answer 2

OK, so the difference between environmental factors and lifestyle factors is that the former are passive on your part. You don't actively decide to expose yourself to lead paint - it's just out there, and if you are around it then it affects you. Whereas a lifestyle factor, like eating junk food, involves very specific decisions and actions on your behalf.

It asks you which item on the list is a lifestyle factor, something you chose to do.