In which region has the original, natural ecosystem been replaced by agriculture? select one:
a. the middle u. s.
b. northeastern canada
c. the southwest u. s.
d. the pacific northwest

A. the Middle U.S.

Explanation:

The Middle U.S is a geographical term used to describe the central part of the United States of America,it ranges from the Northeast to the West coast,filled with rural dwellers whose main occupation is Farming. They get engaged in Agriculture as a way of life and part of their culture.In this region the natural ecosystem has been influenced by agriculture.

a factory opens that mass-produces light bulbs.

explanation:

not sure if that's an answer to your questions but this is an example! : )