When might bias in an experiment occur?
A) A subject does not know who is in the control or experimental groups.
B) A technician knows which samples are from the control group.
C) A subject finds out the results of the experiment after it is finished.
D) A researcher randomly assigns subjects to the control or experimental group.
B
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Nitrifying Archaea such as Nitrosopumilus maritimus use ________ as a sole carbon source and are capable of obtaining sufficient energy by aerobically oxidizing ________
A) CO2 / NO B) sugars / NH3 C) CO2 / NH3 D) organic acids / NO
Which of the following is an advantage of the bird
and mammalian circulatory system? a. It is closed. b. It is fully divided into two circuits. c. There is no mixing of oxygen-poor and oxygenated blood. d. Blood is directly pumped out to body capillaries after oxygenation in the lungs. e. All of these are an advantage.
Identify all of the following cells are capable of releasing histamine
A) damaged tissue cells B) mast cells C) B cells D) Red blood cells
The coronary sinus drains blood directly into the:a
inferior vena cava. b. superior vena cava. c. left atrium. d. right atrium. e. coronary arteries.