What does sulfur dioxide form after it moves into the stratosphere? i would set it to 10 points but i got 22 left, so 5 points. sowy :C

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.