What social medium was invented in 1971 by the computer engineer ray tomlinson? (according to tomlinson, the symbol @ ("at") was the obvious choice for the symbol to separate the names of individuals from their machines.)

Explanation:

Ray Tomlinson was the computer programmer credited with the implementation of the first email program on the Arpanet system, it was able to send emails between users on different hosts that were connected to ARPANET. It was not possible earlier. For this he used @ sign and separated the username from the machine name. This scheme is still used in the e mail addresses.

they remained in rural areas and worked at jobs such as lumbering or farming.

the correct answer is: the fact that the anti-federalist papers were considered poorly written.