"How did the Indigenous populations of North and South America exist before European exploration, and what were the effects of European exploration on these peoples?"

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.

your answer would b. the missisipi river

hope i you : )

fertile good for trade etc

the answer your looking for is c. : )