The exchanging of information. Means of connection.
Different ways of communication are: Speaking, Sign language, Notes (paper messages), etc...
Solution: A modern physician in a small town must be proficient in not only general medicine but surgery as well. ("General medicine" and "surgery" are both objects to the preposition "in.")
OR
Solution: A modern physician in a small town must be proficient not only in general medicine but in surgery as well. ("In general medicine" and "in surgery" are both prepositional phrases.)
Answer:
The small pox vaccine, which was first introduced by Edward Jenner in the year 1796, was the very first successful vaccine to be made. He figured out that milkmaids who already had got cowpox did not get smallpox and found that inoculated vaccinia fought inoculated variola virus.
Explanation: