Xavier studies a unit of world history until he believes he knows it well. he then goes over it several more times. he is using the study skill called

Xavier studies a unit of world history until he believes he knows it well. He then goes over it several more times. He is using the study skill called overlearning.

Explanation:

Overlearning means to practice newly acquired skills beyond the point of initial mastery. The term is also often used to refer to the pedagogical theory that this form of practice leads to automaticity or other beneficial consequences.

well since twins have about the same dna they dont have one think in common which is the figer print. nobodys fingerprint is the same. if your using twin you would most likely get around the same results for both of them because of the genetics.. i hope this

answer; when one group has an extremely high score at pretest;