Essentially, a control variable is what is kept the same throughout the experiment, and it is not of primary concern in the experimental outcome. Any change in a control variable in an experiment would invalidate the correlation of dependent variables<span> (DV) to the </span>independent variable<span> (</span>IV<span>), thus skewing the results.</span>
Answer:
A. Political Science
Explanation:
The answer is political science because law is simply not a science. Economics has more of a focus on studying human activities so that does not fit either.
Dating lol people suck sometimes
Explanation:
Sealed combustion heaters are much safer to operate than other types of space heaters, and operate more efficiently because they do not draw in the heated air from the room and exhaust it to the outdoors. They are also less likely to backdraft and adversely affect indoor air quality.
Less expensive (and less efficient) units use the room air for combustion. They do not have a sealed glass front to keep room air away from the fire and should not be confused with a sealed combustion heater.