Read the hypothesis below and answer the question that follows.
individuals who smoke will have a higher frequency of developing cancer later in life.
which of the following would not be a potential extraneous variable for the stated hypothesis?
a.
the occurrence of lung cancer in subjects
b.
exposure to secondhand smoke
c.
the amount of cigarettes smoked per day by subject
d.
the number of years as a smoker

Correct A) The occurrence of lung cancer in subjects

The chemicals or poison that is present in the tobacco smoke is known to change the DNA of the cell. The DNA is the instructional manual of the cell that controls the cell growth and its function.

Smoking cause lung cancer as it damages the cells that line the lungs. At first the body is able to repair the damage caused but repeated exposure causes the cells to act abnormally and as a result, cancer may develop.

Hence, the correct answer would be option A.

the best answer is, earth strong )

explanation: