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.
It would have to be A. They both describe systems or processes that help to map out the sea florr
<span>The adjectives these and those should be used only with plural nouns.
Those shoes makes sense because there is more than one shoe, but these girl doesn't make sense because there is only one girl.
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The Sage. The other answer is wrong, and if this helps you, please mark it brainliest
