The cdc started in 1946 in atlanta, georgia. at first, the organization focused mainly on the control of malaria—which meant killing mosquitoes. scientists at the center organized a huge effort to spray an insecticide called ddt on more than six million homes. and by 1949, malaria was no longer a serious health problem in the u. s. the author most likely includes this passage to imply that

What makes this part of the anecdote about elisa effective? when [elisa] finally walks home, after seven hours of standing at a cash register, her feet hurt. she's wiped out. it makes the reader trust the author as an authority on teenage issues. it uses emotional language to the reader experience elisa's daily challenges. it presents facts to support the long hours elisa is required to work.