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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
In a comparison of brain found in lower classes of vertebrates to the brain in higher classes of vertebrate's area showing most increase in relative size is: a) Optic lobe b
Why is it more probable that the photosynthetic prokaryotes appeared before the aerobic eukaryotes? It is more feasible that photosynthetic prokaryotes appeared before the aero
SULPHUR The major sources of sulphur are crucifers and animal proteins. Proteins present in pulses have little sulphur. Therefore, other vegetable proteins or crucifers must
Scanning Electron Microscopy (SEM) While 'TEM is useful to study the internal structul-c of thc ccll. SEM is an important technique if you wish to examine the surl'ace features o
What is Skeletal girdles? Explain in brief. In vertebrates, bones which connect the appendages on the left and right side of appendicular skeleton to each other. Skeletal girdl
Define Food Effects in the Survival & Growth of Microorganism? Nature of the food also affects the microbial survival and growth. Each food has its own characteristics which de
STRUCTUR E OF A MYOFIBRIL - The dark bands of the myofibril are termed the A-bands (Anisotropic bands). Each A-band has at its middle a light zone called H-zone (Henson'
Explain the Protection of erythrocytes and cell membrane? Protection of erythrocytes: Vitamin E protects erythrocytes from haemolysis by the production of oxidizing agents
INTRODUCTIO N - Endocrinolog y - Study of endocrine glands, hormones and their effects. Thomas Addison - Father of endocrinology. Described hormonal disease in 1855 kn
Explain the Behavioural change communication? One of the reasons for the widespread prevalence of PEM in our country is ignorance due to illiteracy, particularly among the fema
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