Australia's interior contains very few population centers. the best explanation for this fact is question 2 options: mountain ranges that seal it off from the southern population centers. there are few ways to access the central part of the country. the climate is too harsh to support large cities. many inhabitable swamps dominate the geography.

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.

answer; i believe the answer is 80%, plz check first good luck;