Read the statement below. Some natural resources can be replaced once they are used.

Which sentence from the article provides the BEST support for the statement above?

A. However, though air is limitless in supply, air quality is a problem in many parts of the world because of pollution.
B. Getting enough fresh water is a serious problem in many places.
C. Normally living things replace themselves through reproduction.
D. But such human activities as hunting, logging, building and polluting can cause whole groups of living things to disappear forever.

answer; /// i believe that the correct answer is (a) making presentations;

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.