One group was given a sugar tablet as a placebo in order <em>to include a control group.</em> <u>The correct answer is A.</u>
Explanation:
In all these kinds of experiments with certain medicine in people's bodies, there is one group included that is given placebo -<em>not real medicine, in this case just sugar</em>- in order to let them feel they did actually took the real medicine and have them controlled. By doing this, they don't change their beliefs about the value of a treatment.
Since mature red blood cells do not contain a nucleus, more
room is available for hemoglobin. I am hoping that this answer has satisfied
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