Answer: alternative D.
Explanation: Dr. DeVries should choose his sample population randomly in order for his research to be representative, even having a specific population, which is high school seniors, that he wants to study. By <u>choosing specifically students from an exclusive college preparatory school, he isn't considering how students from other schools might perform in his research test</u>. This would be a very important step for him to understand how the practice in problem solving affects the ability related to it. Otherwise, he will have a distorted result.
If dichloromethane is swapped out and ethyl acetate is used in its place, the extracts then obtained would be highly anti-radical and would be more efficient than dichloromethane.
Since "like dissolves like," ethyl acetate is a polar molecule that works well as a solvent to extract the polar caffeine molecules from coffee beans. The ethyl acetate molecules bind to the caffeine molecules, which then move through the bean cells' cell membranes. After all, the ethanol:water (1:1) solvent combination has been demonstrated to be the best for recovering catechins and delivering extracts with the highest antiradical activity.
Dichloromethane is a volatile colourless liquid used as an organic solvent in many industries. One of its main application is that it used to extract caffeine because of its highly effective solvent nature. Because DCM is a non-polar solvent and caffeine is readily soluble in DCM, it can easily be extracted without losing its aroma.
To know more about dichloromethane, refer to the following link:
brainly.com/question/15402012
#SPJ4
The modern Christmas film almost that starred Jim Carrey is known as Elf.
Elf is a Christmas comedy film that was released in 2003. It was originally written by David Berenbaum and was directed by Jon Favreau.
Jim Carrey is originally known as James Eugene Carrey. He is a Canadian-American actor, comedian, writer, and producer.
Elf movie almost that starred Jim Carrey in 2003 before it eventually started Will Farrell.
Hence, in this case, it is concluded that the correct answer is "Elf."
Learn more here: brainly.com/question/24405439
Answer:
The correct answer is Stimulus control intervention.
Explanation:
Stimulus control is a concept of behavioral psychology that refers to the way an organism behaves when in the presence of a certain stimulus and how that behavior changes in its absence.
<u>A discriminative stimulus is a stimulus that modifies the organism's behavior in this particular manner. </u>
In this particular case, to reduce the temptation to buy and consume the snacks, Grayson starts shopping at a local farmer's market and subscribes to a healthy-eating blog. Grayson is aboiding the stimulus that causes him to elicit the behavior of eating sugary snacks.
In conclusion, Grayson's behavior demonstrates principles of a Stimulus control intervention.
Coronam is the Latin word for crown
