I believe the answer is: A just-noticeable difference
In painting, A just-noticeable difference refers to the amount of things that needed to be change for a difference to be noticeable.
The threshold usually depended on the type of audience that being aimed toward, (for common audience, the threshold of differences would be relatively higher compared to expert audience)<span />
Answer:
the answer is a weeak wall
Explanation:
They are used to transfer water efficiently through the towns and cities of Rome.
D. the Himalayan Mountains in Nepal
