Answer:
Yes
Explanation:
Yes, there is the presence of a threat.
This threat is known as instrumentation. There is an Instrumentation threat when changes are made in the instrument, or the changes are made in the researcher, or the scorer when the research is being carried out.
In this question, mrs smith is the one who is the researcher, the program of reinforcement can be called the instrument. She made errors during the first few week but started getting it right in the second week. So there is a slight change in these two weeks. Causing instrumentation threat to how valid the program is.
Answer: It began when Ronald Regan invented it
Explanation:
macroeconomic appraches the study of economic from the viewpoint of consumers
Explanation:
make envorinment clean.
make surrounding peace.
do not damange public property.
D: The United States was meant to stretch from the Atlantic ocean to the Pacific ocean
