Which is a power granted to the federal government under Article I, Section 8 of the Constitution? power to collect taxes from citizens and states
power to create a national education system
power to name a state governor in times of emergencies
power to call for elections to replace the leader of Congress

power to collect taxes from citizens and states

Explanation:

Article I, Section 8 gives Congress the power to "lay and collect taxes, duties, imports, and excises." The Constitution allows Congress to tax in order to "provide for the common defense and general welfare."

the rebels’ chances of victory at lexington & concord were fairly slim, given the fact that most of them very untrained and they were up against the world's greatest military force.  

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.