<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.
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Two reasons:
1. cold winters
2. rocky soils (not good for growing plants)
The greatest unifying force of the ottoman empire was a common religion.
The correct answer is Jim
Explanation: Jim is the most interest on that because he is the one who wants to buy.