Which of the following was NOT an invention of the Sumerians? A. the plow
B. a system of writing
C. a 365-day calendar
D. the wheel

Which impact did the civil war have on the spread of disease in texas a. disease decreased bc people left the area to fight in the war b. disease increased bc medicine was in short supply. c. disease increased bc many new diseases were brought to the area d. disease decreased bc confederate doctors distribute new medicines to local communities