It's A
Irrigation was overused, the soil didn't get any rest (crop rotation is a younger invention), the result was salinization of the soil, which led to decline of Sumer.
Answer:
Well I don't really know yet but probably 18.
Japan experienced many new positive things because it started becoming more modernized after a long period of seclusion. Of course, some conservative people were against this western influence and rebellions ensued, but it was eventually all solved.
Answer:
I can't see some of wordsss