<span>The threat to internal validity is the Mortality. Internal
validity is the measure in which the causality of the stimuli studied
is analyzed, that is, if the results of the study are due to the
interaction of the variables analyzed or are due to the interaction with
other variables. <span>Mortality is an error that occurs if the
conclusions of the study are made only on the basis of the participants
who were from beginning to end in the investigation, without taking into
account those who left the study.
I hope my answer can help you.
</span></span>
The correct answer is letter C
Explanation: Acquisition of a company is the operation by which one company is absorbed by another, which succeeds in all rights and obligations.
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Answer:
B. provides common industry definitions between Canada and the United States to measure economic activity and reduce barriers of trade for cross-border firms. Not is used by these two countries also Mexico is using it.
The idea behind of NAICS is make easier to trade between these 3 countries.