2. What makes such similarities or differences?

similarities and differences is the process of comparing information, sorting concepts into categories, and making connections to one's existing knowledge. Simply put, identifying similarities and differences helps us make sense of the world.

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.

what are the statements.?