Dr. Norris's research samples generally include young white men and women under the age of 30 years old. Choose a limitation of Dr. Norris's research based on this information.
a) external validity
b) concurrent validity
c) internal validity
d) content validity

Your answer is (c)

Explanation:

cancer can take years to develop.

it could be from radiation, or a cancer causing substance or amny others.

theres lung cancer, brain cancer, breast cancer, heart cancer

explanation:

there are men and women, some choose to be both or change their gender. often times those people go by "other". those who change their gender are known as "transgender"