Answer:
D-building comes and inventing concrete
Explanation:
The Roman Concrete was used from the late Roman Republic to the end of the Roman Empire. It was used to build monuments, buildings, roads, and bridges. The formula of the Roman Concrete was a mix of lime or gypsum, brick or rock pieces, and water. This concrete has been known to be more resistant than modern concrete.
Answer:
After World War II, European countries lacked the wealth and political support necessary to suppress far-away revolts. They could not oppose the new superpowers the U.S. and the Soviet Union's stands against colonialism. Strong independence movements in colonies.
credits :- wikipedia
1. a golden age of stability
<span>4. exchange of inventions and ideas </span>
<span>5. they conquered large parts of Asia under Genghis Khan. </span>
<span>6. it stretched from the pacific to eastern Europe. </span>
<span>10. the weakening of Roman law and government </span>
<span>11. Franks </span>
<span>13. monasticism </span>
<span>15. He forced the Saxons to convert to Christianity </span>
Maarten Schmidt found the spectral lines were high redshift (had their emission lines shifted toward longer, redder wavelengths by the expansion of the Universe)
<span>The puzzle about quasar spectra, which was finally solved by Maarten Schmidt, was </span><span>the brightest known quasar</span>.
Arizona,California,Delaware,Florida,Ilinois, Indiana,Kansas,Maine,Minnesota,New Mexico,North Carolina,Oregon,Virginia,West Virginia,Wisconsin
