Common fears during the school years include a. family finances and college selection. b. monsters and ghosts. c. acts of nature, such as thunder and lightning. d. poor academic performance and the possibility of personal harm.

 d. poor academic performance and the possibility of personal harm.

Explanation:

Academics was the common fear for the students in the school years. The good score and passing marks gives students satisfaction that what they had prepared for the exam has been utilized. Students are scold by the teachers, and parents for poor academic performance. They are not allowed to be promoted to next higher class with poor performance by the school management. The students are also beaten up by their parents for poor academic performance. Almost all students are aware of the fact that if they do not study well their academic performance will get affected and they will not be promoted to next class, this can affect their future.  

the part of the earth that is best reflected on a map is the surface. maps reflect borders of countries or territories as well as physical features like mountains.

explanation:

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.