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In a cohort study that found an association between alcohol consumption and bladder cancer, 20,000 middle-aged men were asked about their drinking habits and then tracked for five years to watch for the development of cancer. Researchers asked the men about their diet and exercise habits, but not about smoking. What is the most likely source of error in this study?
A. Reporting bias
B. The placebo effect
C. Selection bias
D. Confounding variables
From Molecules to the First Cell The prebiotic conditions on the earth in all probability were volcanic eruptions, lightning and heavy rains. There was no trace of free oxygen
CLASSIFICATION OF GENERAL DRUGS - 1 . NATURAL DRUGS - Obtained from natural sources as minerals, animals, plants & microorganism. (i) Minerals - It include
what so special for phylum annelida
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