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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
Rh-factor It is one of the factor associated with blood. In addition to ‘A', ‘B', ‘AB' and ‘O' groups, Rh factor test is also done in the blood. People having Rh factor a
Q. Do amphibians have direct development? In amphibians the embryonic development is indirect there is a larval stage. Q. How different are the respiration in adult amphibi
Prosthodontic considerations In order to achieve good results, understated features should always be examinated. 1. Smile Line: A high smile line increases the esthetic
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In f e c tiou s Diseases Infectious diseases inflicts major economic losses as the disease spreads from one animal to other and large number of animals are affected with t
Through the year of 1960s, the gene was clearly explained as the region of DNA which gives increase to a single polypeptide or to a one RNA for genes whose final product is RNA not
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Is the nervous system in platyhelminthes more or less sophisticated than in cnidarians? What are the main neural structures found in flatworms? How is this neural organization impo
how much water do we loose when we exhale
There are several methods by which a disease-causing organism can be transferred from the reservoir to the host organism. Direct contact : Disease - causing organism may be tr
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