Pls help me with this question: Describe the main challenge Jonas Salk faced Here's the article link: https://sn56.scholastic. com/issues/2020-21/030121/history-m akers-jonas-salk. html

Unit testactivelike sparkling stars strewn across the night sky. their brilliance catching the corner of my eye, making me slow down, just to look at them a little longer. in my awe of the sheer beauty of merely broken glass, i couldn't but thinkhow someone else's tragedycould be so beautiful to me. source: t., jennifer. "irony." teen ink. teen ink, n. d. web. cjuly 2011.the poem is an example ofexternal conflictinternal conflictdramatic ironysituational ironymark this and returnsave and exitsubmit