Why is the commerce clause written in 1787 still adequate to meet the needs of the nation in the 21st century?

The Commerce Clause gives Congress the power to regulate trade with other nations. This is very relevant in the 21st century because we are in a era of globalization in which trade among nations is paramount for development. This is why nations sign trade deals, and the US is no exception to this. In fact, at the moment, the US is negotiating several trade deals, for example with China, a country that already has great economic power.

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.