Answer:
Because people did not know that yellow fever was caused by the bite of an infected mosquito, they assumed incorrectly that people could catch the disease through touch. To help control the disease, letters were cleaned with vinegar before being sent. This did not work, because it was a false cause-and-effect relationship.
Answer:ideal just too the test
Explanation:
The answer would be:
The biography uses a chronological structure; "Marian Anderson Sings" uses flashbacks to narrate the events.
