Answer:
D) Room temperature
Explanation:
For the experiment to work and have good reliable results there should only be one variable. In this case, the variable is the noise level, and the different room temperatures would influence the experiment's results.
One way the President checks judicial power is through his ability to appoint federal judges. Since the President is the Chief Administrator, it's his job to appoint court of appeals judges, district court judges, and Supreme Court justices.
The correct answer is John Stuart Mill.
He was a famous British philosopher who lived during the 19th century. He was a major proponent of utilitarianism, which is an idea that everything we do is supposed to help the society around us. According to him, even happiness is a utilitarian though, meant to help the world.