You haven't given any statements to choose from, but I can explain why paid search results are effective.
Paid seach results market to consumers that are interested in the product or similar products. These consumers are more likely to buy the product, since they are searching for a similar term. Paid search results can reach many people in very little time, and their resulting marketing benefits are almost instantaneous.
True...the assumption being that the student believes he/she will be able to locate the answer within the text rapidly, but they underestimate the fact that "application" of the content/question is primarily what the instructor is looking for, and will require critical thinking skills to apply the book content to the the question; not just "find the answer".
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The arrow is pointing to the nucleus. The function of a nucleus is that is stores the DNA of a cell. It also regulate and control the activities that go on in the cell like groth, and metabolism.
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It can deliver the services faster with higher reliability and quality
