Which was not a feature of the post-civil war department store?
a. electricity
b. negotiation of prices
c. pneumatic tubes
d. telephones

In the Post-Civil War era, one could find many things in a department store but one thing they could not find was a. Electricity.

In the post civil-war era:

Electricity was not present at the time because it had not yet been modernized enough to allow for long distance transmission and not everyone had access to it.

In conclusion, option A is correct.

Find out more about the invention of the telephone at link.

he is known for discovering   the fossil of a female hominin australopithecine   known as "lucy" in the afar triangle region of hadar, ethiopia.

hope this !

have a great day!

the answer is c. hope is