Answer:
i think its C Historical continuity
Answer:
vaccination
Explanation:
Louis Pasteur had been working to find a vaccine that would cure cholera in chickens. His lab assistant gave an older, weaker strain of the disease to the birds. When these birds did not die Pasteur began to rethink his ideas a came up with our current method of administering vaccinations.
Answer:
19TH CENTURY PEOPLE DRESSED MORE CONSERVATIVE THAN THOSE IN THE 21ST CENTURY.
Explanation: