What is the cause of ongoing conflict in the Middle East? A. Crossing of traditional ethnic boundaries of different ethnic groups
B. Different ethnic groups attempt to form a government or gain control of the government
C. Attempt among groups to get independent homeland.
D. All of the above

The first root cause of conflict and terrorism in the Middle East is considered as the legacy of colonial rule or the methods applied during the independence period. Recent turmoil and transition moving across the region has brought renewed attention to the politics of the region.

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.