Migraine study results

the table shows the results of a study testing the effectiveness of a migraine medication. why was one group given a sugar tablet?
a. to include a control group
b. to have an experimental group
c. to provide a variety of treatments
d. to give the body additional nutrients

I'm pretty sure the answer you're looking for is B. An experimental group in a scientific experiment is the group that the experiment procedure is performed on. The independent variable is changed for the group and the response or change in the dependent variable is recorded.

hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

hope this   and an i get brainlsiest