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.
Because they helped him make all the choices and told him what to do they also were like his family and tut trusted them
hope this helped in some way
When centrifuging biohazards, it is recommended that the safety buckets and sealed rotors be: Loaded and unloaded within the biosafety cabinet.
<h3>What is meant by centrifuging biohazards?</h3>
This is the term that has to do with the user of centrifugal force in the separation and the removal of substances in liquid as well as in solid materials.
What is required is that When centrifuging biohazards, it is recommended that the safety buckets and sealed rotors be: Loaded and unloaded within the biosafety cabinet.
Read more on Biohazards here: brainly.com/question/10686710
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the answer is A. Hope I could help
