The statement that explains why randomized controlled trials are often "double blind" is as follows: to decrease bias by ensuring both the participants and researchers do not know who is receiving the treatment and who is not (option B).
<h3>What is a double blinded experiment?</h3>
Double-blinded experiments are forms of scientific testing in which some information is withheld from two different parties.
In summary, neither the tester nor the subjects tested know which are the control items and which are the test items.
A double blinded is conducted to reduce or eliminate bias between the participants and researchers.
Therefore, the statement that explains why randomized controlled trials are often "double blind" is as follows: to decrease bias by ensuring both the participants and researchers do not know who is receiving the treatment and who is not.
Learn more about double-blind at: brainly.com/question/5303449
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The temperature will decrease
Answer:
Below! ;)
Explanation:
The amplitude of a wave is the height of a wave as measured from the highest point on the wave (peak or crest) to the lowest point on the wave (trough). Wavelength refers to the length of a wave from one peak to the next. Wavelength is directly related to the frequency of a given wave form.
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Explanation:
Firstly, humans have a double circulatory system, which increases blood pressure and flow of blood to the tissues. To allow the heart to pump blood around the body, the heart is made of cardiac muscle. These muscle cells have long protein filaments, which have the ability to slide past each other, shortening the cell and leading to contraction. In order to supply oxygen to cells the heart first pumps the blood into the lungs through the pulmonary artery. Here oxygen diffuses from the air in the alveoli into the blood. Blood then returns to heart via the pulmonary vein. It is then pumped out again, towards the rest of the body, through the aorta. Oxygen is then carried around the body by red blood cells. They are specialised cells, which have no nucleus and contain haemoglobin so that there is maximum space for oxygen. The circulatory system is made up of three types of blood vessels. The first type, arteries, carry the oxygenated blood to the tissues. The second type, capillaries, which have very thin wills and a large surface area to allow for easy and maximum diffusion, deliver the oxygen to the cells for respiration and therefore energy release. Waste products such as CO2 are then removed from the tissues, as they diffuse through the capillary walls and into the blood plasma. The third type of blood vessel, veins, then carry this blood back to the heart. Veins contain valves to keep blood flowing in the right direction and prevent back flow.
