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"on the mode of communication of cholera" was a scientific text written by dr. john snow in 1855 about the disease cholera. identify the two primary purposes of this text.
a. to persuade officials and citizens to be more conscious about sanitation
b. to inform readers about new ideas about the disease using scientific evidence as support
c. to narrate the consequences of contracting the disease
d. to describe the lack of sanitation at the time of the story
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