During puberty, adolescents' thoughts center on themselves.
Adolescents are usually quite selfish because they think only about themselves and what is best for them. Before adolescents, their thoughts centered either on their friends or family, but this changes during adolescent years. However, after they go through adolescence, the center of their attention will also shift.
The German scientists were concerned about the Nazi
restriction on uranium sales because uranium can be used in research on atomic
weapons. Though Hitler was a famous dictator,
he was famously known to be skeptical about the ability to build a nuclear
weapon.
The independent variable is the exercise.
Answer: Option C
<u>Explanation:</u>
In a hypothesis done by the experimenters to reach to a conclusion and do researches, certain variables are used. Those variables are of two types, the independent variable and the dependent variable. The latter are dependent on the former in the researches done.
In the experiment in the question, the independent variable is the exercises done by the subjects and the people in the control groups which changes the mood of the people.