<span>1. Movement 2. Flexibility 3. Protection 4. Support</span>
Jonas Salk and Albert Sabin in 1950s developed. separate vaccines. one from killed viruses. and other from live viruses to combat the dreaded disease polio. Salk became a national hero when he allayed the fear of polio with his vaccine, approved in 1955
What are the terms givien?
That it has higher value than other things being sold.