What was one of the challenges Dr. Salk faced in his attempt to create a polio vaccine? (10 points) a
b
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Dr. Salk did not have enough money to pay for his research and supplies.
Dr. Salk had to create one vaccine that was effective against three different viruses.
Dr. Salk had to convince government officials to allow him to test the vaccine.
Dr. Salk's idea for a vaccine was not supported by other scientists and physicians.
с
d
Question 4(10 points)
Read the entry on Jonas Salk from Compton's Encyclopedia/The Britannica School Edition, and answer
Compton's Encyclopedia

Which statement best describes how these paragraphs develop the central idea of the article? a- they elaborate on the idea that the offer has been made with youngsters in mind. b- they provide additional information as to why the prize is a wagon instead of something else. c- they support the idea that the wagon is attractive to youngsters and is a worthy prize. d- they introduce the idea that the newspaper is a generous organization. read paragraphs 4 and 5. the disc wheel coaster wagon is thirty-six inches long and sixteen inches wide. the coaster is built exactly like a high-powered automobile. the disc wheels have rubber tires and true roller bearings. it runs as smoothly as an eight-cylinder automobile. it is built of the strongest wood and is equipped with a reliable hand brake, enabling the owner to stop in an instant. the tongue—usually the first thing about a wagon to break and render the wagon unserviceable—is so stout that a man can jump on it without breaking it.

How did torrance show louie he was forgiven

Why are danforth, hathorne, and the other authorities so resistant to believing the claim that abigail and the other girls are lying?