Smog and other forms of pollution from urban cities can create more carbon dioxide as well as global warming and, in turn, affect rural areas that rely on energy resources for their crops and farmland. also increases the concentration of carbon dioxide which scientists believe is increase atmospheric temperatures worldwide. a) plants b) deforestation c) crop rotation d) acid precipitation

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.

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answer; substantive law;