How did communication improve during the Qin dynasty? 1. A standardized writing system was created.
2. An organized postal system was established.
3. A new system of military message codes was developed.
4. A ban against criticizing the government was passed.

a big wall across the mexican border so no drugs, terrorist, or illegal immigrants can come through : )    

the correct answer is d. the monetary reserve is a set of funds represented in currency, money or similar, saved as a forecast of possible needs or for legal reasons.

the increase or decrease in the monetary base influences in the increase or decrease of the inflation rate. therefore, the excess of monetary reserve will cause the reduction of inflation.

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