Answer:
The author presents how HeLa cells were very susceptible to the polio virus, in addition to being fast growing. This made these cells valuable for polio research.
Explanation:
Polio was one of the most feared diseases of the twentieth century, because it caused many victims, mainly children, causing irreversible damage. For this reason, research into vaccines against polio was extremely important and moved many laboratories around the world. However, there was a problem with this research, which was the difficulty of testing the vaccines created. In this case, HeLa cells were discovered, which were easy to be multiplied in the laboratory and were very susceptible to the polio virus, being the perfect element for carrying out the tests, making it a valuable cell for research against this disease.
The answer is isisisisisis b
It’s antonym you’re welcome
In Georges Santayana's quote, he argues that, if our society, and a much larger scale, our world, is ever going to or wants to make headway and advance, it is going to need to remember its past and see what it can learn and take from it. What Santayana most likely believes that change and progress are two entirely different things. Progress can be interpreted as taking what you have learned from previous events and building upon it, not just merely altering something to look different but keeping it the same in essence. Santayana's quote can be related back to the Civil War because similar events like this had happened before in World History, for example, The English Civil War. Because most American did not know of previous comparable conflicts such as The English Civil War, they did not recognize that they were repeating the steps of many others that led to conflict.
Worth because after the word "authentic", it says that the gold was worth a lot of money.