<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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Answer:
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They are essential elements of: <span> the DAP concept.
</span><span>. the DAP concept aimed to determine at what age Children should start their education in order to achieve the most effective education.
</span>The concept is based on integrating early habits with desirable behavior in the education process.
Americans were upset and disliked Castro. He took away money and a way to make money from them and Castro also went to help and benefit the people the Americans were hurting by providing the Cubans better healthcare and education.
Castro was incredibly popular with the Cubans as he allowed for them to not only have their land and means of living and earning money back, but he also promised to better them by giving them better healthcare and education.