That's because you have to have a lighting source so as to avoid pixelated dark photos, and as there's no natural light indoors, or it goes away quickly as it depends on windows, you have to use artificial lighting.
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DISTRACTION WITH YOUR GROUP FRIENDS, THE TONE OF THE INSTRUCTOR HAS A SIGNIFICANT IMPORTANCE, BECAUSE HE / SHE WILL DETERMINE IF THE ENTIRE CLASSROOM WILL UNDERSTAND THE SUBJECT MATTER ADDRESSED (ON AVERAGE POPULATION, IT WILL ALWAYS DEPEND ON THE RESPECTIVE STUDENT).
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ANOTHER DIFFERENT ISSUE IS THE AIR CONDITIONINIG (HEATING, VENTILATION, AND AIR CONDITIONING), IF THE SPACE IS HOT, STUDENTS AND NOT EVEN THE PROFESSOR WILL TOLERATE SUCH A CLIMATE CHANGE.
ON THE OTHER HAND, IF IT IS TO COLD, THE PERSONS WHO DO NOT HAVE THE APPROPRIATE ATTIRE (SUCH AS SHORT SLEEVES) FOR THE MOMENT WILL SHIVER A THE CLASS CONTINUES.
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THE PLACE WHERE THE STUDENTS SITS DOWN HAS TO BE COMFORTABLE IN ORDER TO PARTICIPATE AND PERFORM DURING THE DAY.
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FINALLY, IT IS IMPORTANT TO BE CORRECTLY NOURISHED PRIOR (BEFORE) THE DISCOURSE INITIATES.
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In my opinion it's cliche but not bad