Can Vitamins Cause Cancer

Which of the following hypotheses is NOT directly testable using experiments?

a. Artificial sweeteners can cause bladder cancer.
b. Vitamin E supplements can extend life span.
c. Athletes are more aggressive than non-athletes.
d. Mammals appeared in the living world before the dinosaurs became extinct.

D.
You can't perform an actual experiment. The only thing you can do is try to find fossil evidence, and date it.

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